baber/WOPTO huggingface dataset:
Patent UA-120512-C2 (UA)
Title: Ski grippers
Inventor: SÆTEREN MIKAL
Filed: 2015-03-31
Abstract: On a pair of skis, a strip is mounted lengthwise to each ski's outer side along the ski center portion/grip zone. The strip's width is from 17 to about 60 mm, height at most equivalent the ski thickness throughout, and length about equivalent the length of the ski grip zone. The strip's bottom inner edge is about smooth high with the ski base/sliding surface (A). The strip's underside (B) is widthwise outward sloping about 5 degrees upward related to the sliding surface (A). This underside (B) has an interleaving with a depth of about 2 mm, into which interleaving a piece of skins is attached, which skins constitutes the gripping surface (C). The inner edge of the gripping surface (C) then goes about 5 mm from the outer edge of the sliding surface (A), and the anterior, outer, and rear edges of the gripping surface (C) go about 2 mm from the respective adjacent bottom edges of the strip. Due to the described angel between the gripping surface (C) and the sliding surface (A), only the gripping surface (C) will be in contact with and rest on the substrate to give optimal grip, when this side is laid flat on the substrate. And only the sliding surface (A) will be in contact with and rest on the substrate to give optimal glide, when this side is laid flat on the substrate, due to the described distance as well to the angel between the two surfaces. Hence in order to get grip, stepping a bit over onto the outer side of the foot is required. With the Ski Grippers on the outer sides of the skis, the ski's inner bottom edges are retained for skating and for plow breaking in downhills. The Ski Grippers are meant fairly easily to be taken off the skis in conditions where they are less suitable.
Patent UA-119489-C2 (UA)
Title: Спосіб отримання нанокомпозита оксид церію-діоксид кремнію
Filed: 2017-07-07
Abstract: Винахід належить до галузі хімії. Спосіб отримання нанокомпозиту оксид церію-діоксид кремнію полягає у формуванні однорідних наночастинок оксиду церію на поверхні нанодисперсного діоксиду кремнію шляхом приготування тиксотропної суспензії діоксиду кремнію в етанольному розчині солі амонію-церію(ІV) нітрату з подальшим додаванням розчину гідроксиду амонію і формуванням оксиду церію в процесі термічної обробки. Винахід забезпечує одержання нанокомпозиту з вузьким розподілом частинок за розміром, суспензія яких є стійкою у широкому діапазоні водневого показника рН, при цьому вміст наночастинок діоксиду церію у нанокомпозиті складає від 0,5-1,0 мас. %, а їх розмір знаходиться у межах від 5 до 15 нм.
Patent UA-121503-C2 (UA)
Title: 2,3-dihydro-4h-1,3-benzoxazin-4-one derivatives as modulators of cholinergic muscarinic m1 receptor
Inventor: SUGIMOTO TAKAHIRO
Filed: 2016-06-23
Abstract: The present invention provides a compound having a cholinergic muscarinic Ml receptor positive allosteric modulator activity, which may be useful as a prophylactic or therapeutic drug for Alzheimer's disease, schizophrenia, pain, sleep disorder, Parkinson's disease dementia, dementia with Lewy bodies and the like. The present invention relates to a compound represented by the formula (I) or a salt thereof: wherein each symbol is as defined in the attached DESCRIPTION.
Patent UA-123591-C2 (UA)
Title: Cloud detection on remote sensing imagery
Inventor: GUAN WEI
IPC: G06V10/30
Filed: 2016-11-15
Abstract: A system for detecting clouds and cloud shadows is described. In one approach, clouds and cloud shadows within a remote sensing image are detected through a three step process. In the first stage a high-precision low-recall classifier is used to identify cloud seed pixels within the image. In the second stage, a low-precision high-recall classifier is used to identify potential cloud pixels within the image. Additionally, in the second stage, the cloud seed pixels are grown into the potential cloud pixels to identify clusters of pixels which have a high likelihood of representing clouds. In the third stage, a geometric technique is used to determine pixels which likely represent shadows cast by the clouds identified in the second stage. The clouds identified in the second stage and the shadows identified in the third stage are then exported as a cloud mask and shadow mask of the remote sensing image.
Patent UA-124971-C2 (UA)
Title: Erosion and corrosion resistant white cast irons
Inventor: DOLMAN KEVIN FRANCIS
Filed: 2017-06-26
Abstract: A casting of a hypereutectic white iron that, in an as-cast form of the casting, has a microstructure that includes a ferrous matrix that contains 12-20 wt. % chromium in solution in the matrix, eutectic chromium carbides dispersed in the matrix, primary chromium carbides dispersed in the matrix, and optionally secondary carbides dispersed in the matrix. The eutectic carbides are 15-25 vol. % of the casting and the primary carbides are 25-35 vol. % of the casting. When present, the secondary carbides are up to 6 vol. % of the casting.
Patent UA-126107-C2 (UA)
Title: Fishing lure, fishing lure production method, and fishing method
Inventor: MAJI HISASHI
Filed: 2020-02-28
Abstract: Provided is a fishing lure able to make a vibrating motion and mimic the motion of fishing bait fish or crustaceans such as shrimps even while falling in water (for example, freshwater or seawater), and able to prevent a needle from being caught by an obstacle. In this fishing lure, a wire part extends through one of a plurality of holes of a blade part to the opposite side of the blade from a body, is provided with a curved section curved at the position to which the wire part extends, and extends from the curved section through another hole of the plurality of holes of the blade part to the body side of the blade part. A major part of the blade part is located above the body. When the fishing lure is pulled forward in water, a first side section and a second side section of the blade part alternately vibrate around the wire part toward the body. The vibrating motion of the blade part is regulated by the wire part and by collision of a portion near a first end of the blade part with a front portion of the body.
Patent UA-77176-C2 (UA)
Title: Use of combination of active agents with bioregulatory properties
IPC: A01N43/40
Filed: 2002-04-12
Abstract: The invention relates to the use of particular quaternary bioregulatory active agents in combination with triazole derivatives, in particular, metconazole or an agriculturally applicable salt thereof. Corresponding means are also disclosed.
Patent UA-74102-C2 (UA)
Title: Bitter liqueur "poliska zhuravlyna" (polissia cranberry}
Inventor: IVANOV ROSTYSLAV IVANOVYCH
IPC: C12G3/06
Filed: 2004-06-03
Abstract: Bitter liqueur contains sugar, citric acid, red synthetic edible staining agent (?? 127) 06071 of the company "ETOL", liquid aromatizer Cranberry 02533 of the company "ETOL", vanillin, ethyl rectified alcohol and prepared potable water.
Patent UA-78535-C2 (UA)
Title: Method to make fibre reinforced structural element, method to make unit with bolt fixture, bolt or assembly with fixture element to use in fibre reinforced structural element, fibre reinforced structural element and assembly with bolt fixture.
IPC: F16B17/00
Filed: 2003-01-09
Abstract: A method of producing a fibre reinforced structural element including a plurality of bolt fixtures (22) or bolts (28) for the fixation of the structural element to another structural element, comprises the steps of: Providing an elongated core element (12) of fibre reinforcement material having an end part (20) for the mounting or fixation of one of the bolt fixtures or bolts. Mounting the one bolt fixture or bolt on the end part for producing a subassembly. Fixating the one bolt fixture or bolt to the end part in a pulltrusion process by pulling the subassembly through a pulltruder, by circumferentially covering the subassembly with reinforcing fibres (26) and resin and by healing and curing the resin to provide a casing circumferentially encircling the subassembly. Machining the subassembly for providing a bolt fixture or bolt assembly including the element and the one bolt fixture or bolt and the core element. Repeating the steps i-iv for producing a plurality of the bolt fixtures or bolt assemblies Positioning the plurality of assemblies according to the intentional position of the plurality of bolt fixtures or bolts. Producing the fibre reinforced structural element including the plurality of bolt fixtures or bolts constituted by the plurality of assemblies in an extrusion, a pulltrusion or a fibre reinforcing production technique.
Patent UA-75280-C2 (UA)
Title: Norbon-5-en-2-carboxy-3-carboxylate 1-oxide-2,6-dimethylpyridine (yvinor) - plants growth regulator and evolution stimulator
Inventor: PETRENKO VOLODYMYR STEPANOVYCH
IPC: C07D213/89
Filed: 2004-09-09
Abstract: Norbon-5-en-2-carboxy-3-carboxylate 1-oxide-2,6-dimethylpyridine (yvinor) Is highly effective plants growth regulator - accelerates growth and evolution of either rootage and aerial parts of mono- and bicotyledonous plants series.
Patent DE-4230806-C5 (DE)
Title: Dichtungsring aus einem Gummi-Hohlkammerprofil und Verfahren zu seiner Herstellung
Inventor: HUENTELER WERNER
IPC: B60J10/23
Filed: 1992-09-15
Granted: 2013-12-05
Abstract: Verfahren zur Herstellung eines als Hohlprofil ausgebildeten Dichtungsrings aus Gummi, wobei zwei Stirnenden des Hohlprofils miteinander vulkanisiert werden, dadurch gekennzeichnet, daß eine vulkanisierbare Gummifolie (9) großflächig in dem Bereich, in dem die Stirnenden aneinander stoßen an die Innenwandung beider Stirnenden vulkanisiert wird, wobei die Folie (9) auf einem Trägerelement (6) angeordnet ist, welches sie gegenüber dem Inneren des Hohlraums (4) bis zur Beendigung der Vulkanisation abstützt.
Patent DE-10082489-C5 (DE)
Title: Ausrücksystem
Inventor: ROGNER AXEL
IPC: F16D25/08
Filed: 2000-08-11
Granted: 2017-10-26
Abstract: Ausrücksystem (1) zur Betätigung einer Reibungskupplung (3) in einem Antriebsstrang eines Kraftfahrzeugs im Kraftweg zwischen zumindest einer Antriebseinheit wie Brennkraftmaschine und einer Abtriebseinheit wie Geschwindigkeitswechselgetriebe mit einer Getriebeeingangswelle (8) und einem aus Getriebegehäusebauteilen bestehenden Getriebegehäuse (9, 109, 209), bestehend aus einem Geber (70) zur Aufnahme eines von einem Fahrer direkt über ein Pedal (72) oder über einen Aktor eingeleiteten Betätigungsimpulses, einem die Reibungskupplung (3) betätigenden Ausrücker (5, 105, 305, 405) mit einem Ausrückergehäuse (10, 110, 210, 310, 410) aus Kunststoff, einem durch den Betätigungsimpuls axial gegen das Ausrückergehäuse (10, 110, 210, 310, 410) verlagerbaren und über ein Ausrücklager (5a) einen die Reibungskupplung verspannenden Energiespeicher (4) beaufschlagenden Ausrückerteil sowie einer Verbindung (71) zur Übertragung des Betätigungsimpulses vom Geber (70) auf den Ausrücker (5, 105, 305, 405), wobei der Ausrücker (5, 105, 305, 405) zentral um die Getriebeeingangswelle (8) angeordnet ist und axial dem Ausrücklager (5a) entgegengesetzt an ein Getriebegehäusebauteil (9, 109, 209) angeordnet und an diesem befestigt ist, wobei das Ausrückergehäuse (10, 110, 210, 310, 410) mittels einer Selbstverriegelungseinrichtung (11, 111, 211), die eine Schnappverbindung ist und aus radial abstehenden Zungen (13) des Kunststoffgehäuses (10) des Ausrückers gebildet ist, am Getriebegehäusebauteil (9, 109, 209) befestigt ist, wobei am Getriebegehäusebauteil (9, 109, 209) und am Ausrückergehäuse (10, 110, 210) zur Bildung der Selbstverriegelungseinrichtung (11, 111, 211) zueinander komplementäre, miteinander einen Formschluss bildende Mittel (12, 112, 212, 13, 113, 213) vorgesehen sind, wobei das am ...
Patent DE-10237425-C5 (DE)
Title: Handhabungsvorrichtung für Werkzeughalter
Inventor: GRUND PETER
IPC: B25B11/00
Filed: 2002-08-09
Granted: 2009-10-22
Abstract: Handhabungsvorrichtung für Werkzeughalter (20; 46), insbesondere solche mit einem Kegelschaft oder Hohlschaftkegel (HSK) und insbesondere zum manuellen Einlegen solcher Werkzeughalter (20; 46) in das Werkzeugmagazin (14) einer Werkzeugmaschine (10), mit einem Handgriff (32) zum manuellen Greifen und Führen der Handhabungsvorrichtung (30; 100; 120; 140), mit einem Aufnahmeelement (40, 42; 122) zum Aufnehmen eines Werkzeughalters (46), mit einem verstellbaren Verriegelungselement (70, 78; 70, 102; 110; 130) zum Sichern des Werkzeughalters (46) in dem Aufnahmeelement (40, 42; 122) gegen Herausfallen, und mit einem Orientierungselement (54; 102), das eine definierte Drehwinkelposition (64) des Werkzeughalters (46) in dem Aufnahmeelement (40, 42; 122) erzwingt.
Patent DE-102006025653-C5 (DE)
Title: Aseptisches Doppelsitzventil
Inventor: BLECHNER THOMAS
IPC: F16K1/44
Filed: 2006-05-29
Granted: 2010-10-14
Abstract: Aseptisches Doppelsitzventil  – mit einem Gehäuse (1), welches Anschlüsse für zwei Rohrleitungen (2, 3) hat,  – mit zwei Ventilsitzen (4, 5), welche im Gehäuse (1) zwischen den Anschlüssen für die beiden Rohrleitungen (2, 3) vorgesehen sind,  – mit einem ersten Schließkörper (6), der mit einem ersten (4) der beiden Ventilsitze (4, 5) zusammenarbeitet,  – mit einem zweiten Schließkörper (7), der mit dem zweiten Ventilsitz (5) zusammenarbeitet,  – mit einer vom ersten Schließkörper (6) ausgehenden hohlen ersten Stange (8),  – mit einer vom zweiten Schließkörper (7) ausgehenden zweiten Stange (9), welche längsverschieblich in der hohlen ersten Stange (8) geführt ist,  – mit einer außerhalb des Gehäuses (1) angeordneten Betätigungseinrichtung, durch welche die beiden Schließkörper (6, 7) betätigbar sind, wozu die beiden Stangen (8, 9) abgedichtet aus dem Gehäuse (1) herausgeführt sind und unter der Einwirkung der Betätigungseinrichtung stehen,  – und mit einer Dichtung...
Patent RU-2237063-C9 (RU)
Inventor: KUEHVAS KARMEN
IPC: C07D487/18
Filed: 2000-05-15
Granted: 2008-10-10
Abstract: FIELD: organic chemistry, chemical technology, medicine, oncology. 
     SUBSTANCE: invention relates to methods for preparing compounds of the formula (XVII b): 
     
       
     
     wherein R 1  represents optionally protected or modified aminomethylene group, optionally protected or modified hydroxymethylene group; R 4  represents hydrogen atom (-H); or R 1  and R 4  form in common group of formulas (IV), (V) 
     
       
     
     represents hydrogen atom (-H) or -OH; R 7  represents -OCH 3 ; R 8  represents -OH; or R 7  and R 8  form in common the group -O-CH 2 -O-; R 14a  and R 14b  represent hydrogen atom (-H), or one represents hydrogen atom (-H) and other represents -OH, -OCH 3  or -ОСН 2 -СН 3 ; or R 14a  and R 14b  form in common keto-group; R 15  represents hydrogen atom (-H) or -OH; R 18  represents hydrogen atom (-H) or -OH; R 21  represents hydrogen atom (-H), -OH or CN, and their derivatives. Compounds are synthesized from 21-cyano-compound of the formula (XVIb): 
     
       
     
     Invention relates also to new compounds of formulas 
     
       
     
     
       
     
     These compounds elicit both antibacterial and antitumor activity. Invention provides preparing new compounds comprising the condensed system consisting of five rings eliciting valuable pharmacological properties, and in alternative methods for synthesis of some derivatives of ecteinascidine and related compounds. This allows providing more economic ways for preparing antitumor agents and preparing new active compounds. 
     EFFECT: improved preparing method, valuable medicinal properties of compounds. 
     52 cl, 4 tbl, 65 ex
Patent RU-2695425-C9 (RU)
Inventor: LEAHY HUGHIE
IPC: G08B17/00
Filed: 2015-02-27
Granted: 2021-02-10
Abstract: Изобретение относится к системе подавления взрыва. Технический результат заключается в  создании системы подавления взрыва, пригодной для использования  на широком круге объектов. Система может включать в себя пушку, содержащую ствол и резервуар для движущей среды, патрон для заполнения средством подавления, выполненный так, что этот патрон может быть вставлен в ствол, и механизм запуска, располагающийся между стволом и резервуаром для движущей среды. Патрон для заполнения средством подавления может быть выполнен так, что патрон может оперативно взаимодействовать с источником движущей среды. В состав системы могут быть включены один или несколько датчиков взрыва, которые могут представлять собой датчики одного или нескольких типов, а устройство подавления взрыва может быть выполнено так, что это устройство может активироваться в случае, когда один или несколько датчиков указывают на осуществление взрыва. Кроме того, изобретение относится к механизму блокировки для системы подавления взрыва, причем этот механизм блокировки включает в себя механический и/или электрический компонент. Между объемом вещества, являющегося средством подавления, и объемом вещества, являющегося движущей средой, в системе подавления взрыва размещены исполнительные механизмы. 4 н. и 11 з.п. ф-лы, 18 ил.
Patent DK-16188-D0 (DK)
Inventor: NOFRE CLAUDE
IPC: A23L27/30
Filed: 1988-01-14
Abstract: Sweetening agents of the formula: <IMAGE> in which, in a preferred embodiment, R0 is: either a heterocyclic ring constructed on a cyclopentadienyl or phenyl group by replacement of 1 to 3 cyclic C with N, O or S, or an indanyl, indenyl, naphthyl or tetrahydronaphthyl group or a heterocyclic derivative constructed on these groups by replacement of 1 to 4 cyclic C with N, O or S; R1 is H or CH3; R2 is a 2-13 C hydrocarbon group in which up to 4 C may be replaced by N, O, S, Cl, Br and I and up to 5 H by F; R3 and R4 are H.
Patent DK-63488-D0 (DK)
Inventor: URABE MIKIO
IPC: A61K35/50
Filed: 1988-02-08
Abstract: The use of human blood coagulation factor XIII for the treatment of ulcerative colitis is demonstrated in 4 representative cases. Treatment with factor XIII leads to rapid and total disappearance of the chief symptoms realizing transition to the remission stage.
Patent DK-73491-D0 (DK)
Inventor: FERRELL THOMAS L
IPC: G02B21/00
Filed: 1991-04-22
Abstract: A method and apparatus for photon scanning tunneling microscopy for examining a sample in a sample area on a surface at a subwavelength resolution is disclosed. The method comprises generating a near-field of photons at a surface containing a sample area. The near-field has an area that is larger than the sample area, and the near-field has an exponentially increasing intensity in a direction perpendicular to and towards the surface. The near-field is sampled with a probe which receives photons from that near-field that tunnel from the surface to the probe. The received photons are detected and a detector produces an output signal that is proportional to the number of photons received by the probe. The sample area is scanned with the probe in at least one direction parallel to the surface. While scanning, the probe may be maintained either at a position of a constant near-field intensity or at a position of constant distance from the surface. A photon scanning tunneling microscope for using the method is also disclosed.
Patent DK-105290-D0 (DK)
Inventor: USHERWOOD PETER NORMAN RUSSELL
IPC: C07C235/34
Filed: 1990-04-27
Abstract: A compound of formula I optionally in the form of an acid addition salt <CHEM>  in which formula:  A represents a substituent which is: hydroxyl, O-alkyl, O-cycloalkyl, O-alkenyl, O-aryl, O-aralkyl, O-carbamate, O-carbonate, O-acyl or halogen  a is O-5;  the substituents A are identical or different when a is more than 1; B represents a C1-C6 aliphatic hydrocarbon group optionally carrying one or more of the substituents: hydroxyl, amino, halogen, C1-C4 alkoxy, C1-C4 alkyl, aryloxy or carboalkoxy and optionally comprising one or more sites of unsaturatlon and/or one or more carbonyl groups or ketal derivatives thereof;  b is O or 1; c, d, f and h, which may be identical or different, are 2, 3, 4, 5 or 6;  and i is 0 or 1 D, E and F, which may be identical or different, represent hydrogen or C1-C4 alkyl or cycloalkyl, and G and J which may be identical or different represent hydrogen, alkyl or cycloalkyl or G and J together with the nitrogen atom to which they are attached represent a saturated heterocyclic ring system.
Patent DK-250083-D0 (DK)
Inventor: NONNENMACHER WILFRIED
IPC: F16L51/02
Filed: 1983-06-02
Abstract: 1. Articulated pipe section with at least two bellows (13, 15, 53) in each case arranged between two pipe portions (17, 17', 19, 21) each of which has an arm part (31, 31', 25', 23, 25) and two arm parts (23, 25, 25', 31, 31', 55) of adjacent pipe portions (17, 17', 19, 21) are interconnected in articulated manner, characterized in that each pipe portion (17, 17') arranged between two bellows (13, 15, 53) is completely projected over by its arm part (31, 31', 257) and that two arm parts (31, 31', 25', 23', 25, 55), which are separated by a pipe portion (17, 17') and two bellows (13, 15, 53), are so interconnected in conformal manner by meshing tooth systems (47, 49, 61, 63) or (69, 71) constructed on the ends, that the deflection of the bellows (13, 15, 53) during each overall deflection coincides.
Patent DK-291884-D0 (DK)
Inventor: SAKAMOTO TERUO
IPC: A61K9/52
Filed: 1984-06-14
Abstract: Highly potent long-acting formulations of cefaclor for treating bacterial infections in humans or other animals comprise a rapid-release component and a slow-release component in a ratio of about 3:7 to about 5:5 by potency of cefaclor. Such formulations are convenient for administration or carrying about.
Patent DK-295084-D0 (DK)
Inventor: HEIKONEN MATTI
IPC: A23K3/02
Filed: 1984-06-15
Abstract: The invention relates to a composition and method for ensiling fodder and grain. The composition contains glucose oxidase in a carrier medium in an amount effective to produce gluconic acid upon addition to the material to be ensiled. A suitable amount of glucose oxidase to be added is from 10,000 to 10,000,000 IU perton of material to be ensiled.
Patent DK-368186-D0 (DK)
Inventor: TWIGG MARTYN VINCENT
IPC: C07C211/05
Filed: 1986-08-01
Abstract: Alkylamines are produced by reacting an alcohol with an amino compound, especially ammonia, using a catalyst containing nickel and or cobalt and at least one difficulty reducible metal oxide, e.g. alumina, particularly alumina plus a rare earth, and having a high nickel'cobalt content.
Patent DK-443784-D0 (DK)
Inventor: EFFLAND RICHARD CHARLES
IPC: C07D401/12
Filed: 1984-09-18
Abstract: This invention relates to pyrrolylaminopiperidines and related compounds of the formula  <IMAGE>  where R is hydrogen, loweralkyl, Arloweralkyl, cycloalkylloweralkyl, loweralkenyl and thienylloweralkyl; R1 is lower alkyl, hydrogen, loweralkylcarbonyl, loweralkoxycarbonyl, loweralkylthiocarbonyl of the formula  <IMAGE> cyano, loweralkylaminocarbonyl, diloweralkylaminocarbonyl, cycloalkylcarbonyl, cycloalkylloweralkylcarbonyl and loweralkenylcarbonyl; R2 is hydrogen, halogen and methyl; and the pharmaceutically acceptable acid addition salts thereof.
Patent DK-517689-D0 (DK)
Inventor: SIMON HERBERT
IPC: C07C235/28
Filed: 1989-10-18
Abstract: The present invention provides pharmaceutical compositions effective against angina-like heart and circulatory diseases containing at least one nitroxyalkylamine derivative of the general formula: <IMAGE> (I)  wherein R1 is a hydrogen atom, a lower-alkyl radical, a C3-C8-cycloalkyl or C3-C8-cycloalkenyl radical, an aminocarbonyl, C1-C6-mono- or di-alkylaminocarbonyl radical, R2 is a hydrogen atom, a lower-alkyl radical or a C3-C8-cycloalkyl or cycloalkenyl radical or R2, together with R1 and the nitrogen atom to which they are attached, form a heteroaliphatic ring containing up to 6 carbon atoms, A is a valency bond or a straight-chained or branched lower-alkylene radical, in which a -CH2- group can be replaced by a cycloalkylene radical, B is a lower-alkylene radical, in which a -CH2- group can be replaced by a cycloalkylene radical and X is an -NR3-CO- or -CO-NR3- radical, in which R3 is a hydrogen atom or a lower-alkyl radical, when X is an -NR3-CO- radical, R3, together with the nitrogen atom and a carbon atom of the group A, bridge a heterocyclic ring containing 4 to 6 carbon atoms or R3, together with R2, A and the two nitrogen atoms, bridge a heterocyclic ring containing 3 to 5 carbon atoms; and the optically-active forms and physiologically acceptable salts thereof.