baber/WOPTO huggingface dataset:
Patent DK-0447925-T3 (DK)
Inventor: PUETZ GREGOR
IPC: A47B85/04
Filed: 1991-03-12
Granted: 1996-04-09
Abstract: The invention relates to a table-type piece of work furniture, particularly for schools, comprising a frame-type structure with a horizontal or virtually horizontal working surface. In order to provide for such a piece of work furniture to be used if necessary as an upholstered-type piece of furniture for sitting but without using the working surface, an upholstered seating surface (6,8) with an upholstered backrest (7,9) is designed within the structure (2) and beneath the working surface (4) and the seating surface (6,8) with the backrest (7,9) may be brought into the sitting position by rotating it through an angle of around 90 DEG . <IMAGE>
Patent DK-0458699-T3 (DK)
Inventor: BOUSQUET PASCAL PIERRE
IPC: A61K31/195
Filed: 1991-05-23
Granted: 1995-06-12
Abstract: The invention relates to the use of baclofen for the treatment of angina pectoris.
Patent DK-0498133-T3 (DK)
Inventor: GRANDGEORGE MICHEL GASTON JOSE
IPC: A61K38/16
Filed: 1992-01-01
Granted: 1999-11-15
Abstract: The process for purifying albumin from supernatant IV, and in particular IV-4, or from COHN's fraction V or from a plasma supernatant or fraction of similar composition derived from an alcoholic or non-alcoholic fractionation, comprises a hydrophilic anion-exchange column step, with binding of albumin on the column followed by elution, and a hydrophobic anion-exchange column step. The albumin thus obtained, having an electrophoretic purity, determined on cellulose acetate, of > 99%, is free of impurities which can be detected by crossed immunoelectrophoresis and free of polymers.
Patent DK-0501708-T3 (DK)
Inventor: BRADBURY DAVID
IPC: C02F1/42
Filed: 1992-02-24
Granted: 1995-01-30
Abstract: A method for the combined removal and destruction of nitrate ions in an electrochemical cell which comprises an anode compartment containing electrolyte and an anode, a cathode compartment containing electrolyte and a cathode and a central compartment containing an anion exchange resin, the central compartment being separated from the anode compartment and the cathode compartment by an anion permeable membrane, which method comprises the steps of   (i)(a) either passing an aqueous solution containing nitrate ions through the anion exchange resin in the central compartment of the cell, or (i)(b) passing an anion exchange resin loaded with nitrate ion through the central compartment of the electrochemical cell, (ii) passing an electric current through the cell in order to cause the nitrate ions captured on the anion exchange resin to migrate into the anode compartment of the cell, and (iii) destroying the nitrate ions by subjecting them to reduction and oxidation reactions to form nitrogen and oxygen or water.
Patent DK-0571780-T3 (DK)
Inventor: EBERTSCH ALBERT
IPC: B05B11/00
Filed: 1993-04-30
Granted: 1996-04-29
Abstract: The invention relates to a screw closure, in particular for fastening a closure with a nebulizer pump on a glass bottle. Provided on the thread (14) of the threaded mouth of the glass bottle is at least one ramp region (16, 18) which interacts with a counter-surface of the closure to secure the closure against unscrewing. A safeguard of the closure in the closed position which is simple in design and therefore cost-effective is implemented in that the ramp region (16, 18) extends radially outwards from the thread (14), in that the ramp region (16, 18) has a corner or edge on its radially outer end (20, 22), and in that the counter-surface can be deformed by the corner or edge (20, 22). <IMAGE>
Patent DK-0576913-T3 (DK)
Inventor: MELLONI PIERO
IPC: A61P9/00
Filed: 1993-06-16
Granted: 1997-11-03
Abstract: Digitoxigenin and dihydrodigitoxigenin 3 beta -derivatives, a process for their preparation and pharmaceutical compositions containing same for the treatment of cardiovascular disorders such as heart failure and hypertension are disclosed.
Patent DK-0582543-T3 (DK)
Inventor: HAENER GOTTFRIED
IPC: F16L13/14
Filed: 1993-07-07
Granted: 1998-09-14
Abstract: Coupling for permanent pipe connections, whereby the ends of two pipes (2a,3a) are joined by cold deformation to an inner support sleeve (6) and an outer press sleeve (5) by radial pressing. The support sleeve has a coupling device (4) formed on it and the press sleeve (5) and annular grooves on its inner surface. These are arranged so that the press sleeve grooves lie between adjacent support sleeve grooves, when the sleeves are fitted to the two pipe ends. A press tool arrangement for making the joint, using a conical segmental inner tool and an outer sleeve with a conical bore, is also claimed.
Patent DK-0665849-T3 (DK)
Inventor: SEILZ CARSTEN
IPC: C07J1/00
Filed: 1993-10-21
Granted: 1998-04-06
Abstract: PCT No. PCT/EP93/02905 Sec. 371 Date May 26, 1995 Sec. 102(e) Date May 26, 1995 PCT Filed Oct. 21, 1993 PCT Pub. No. WO94/09024 PCT Pub. Date Apr. 28, 1994The invention relates to a process for the alkylation of estrone derivatives, which is characterized in that a suspension of the estrone derivatives in dimethylformamide is produced and carbonic acid diester and guanidine and/or alkyl guanidines are dissolved in it and in the largely oxygen-free mixture, the reaction is performed at 100 DEG -200 DEG  C. under the reaction pressure being established.
Patent DK-0631933-T3 (DK)
Inventor: COGNIGNI SILVANO
IPC: B65G47/14
Filed: 1994-06-13
Granted: 1997-10-13
Abstract: An apparatus for picking up items (P) from a containment volume (V) and for selectively feeding them to a loading station (C1, C2), which includes:   a rotatable body (2) interposed, in use, between the containment volume (V) and the loading station (C1, C2), with a peripheral portion of the rotatable body (2) extending into the containment volume (V), at least one aperture (12) round the periphery of the rotatable body (2) whereby rotation of the rotatable body (2) causes the at least one aperture (12) to travel a path which passes, at least in part, through the containment volume (V), pump means (6 to 10) terminating at the at least one aperture (12) and provided to establish an air-pressure gradient through at least one aperture (12) to draw the items (P) onto the surface of the rotatable body (2), whereby rotation of the rotatable body (2) causes the items (P) to be entrained from the containment volume (V), transfer means (14) acting between the surface of the rotatable body (2) and the loading station (C1, C2) selectively to transfer towards this loading station (C1, C2) the items (P) picked up from the containment volume (V) and held on the surface of the rotatable body (2) by the pressure gradient.   <IMAGE>
Patent DK-0649609-T3 (DK)
Inventor: SCHWAN HERMANN WOLFGANG
IPC: A41D13/06
Filed: 1994-10-11
Granted: 1999-09-13
Abstract: A knee protector has a box-shaped basic body (1) which surrounds the front area of the knee and forms a pad for the front area of the knee. The basic body has a shell-shaped supporting surface (2) for supporting the shin below the knee joint and a set-back region (5) above the supporting surface (2). In this set-back region (5), the kneecap is freely movable in the non-bent state of the leg. <IMAGE>
Patent DK-0664584-T3 (DK)
Inventor: HENRICI DIETER DIPL-ING
IPC: H01R33/22
Filed: 1994-12-03
Granted: 1996-05-13
Abstract: An electrical light bulb socket and holder has a main unit (10) that has a screw thread (15) section to receive a bulb and protective sleeve (14) that has projections (33) fitting over a formed lip (32). The main body has an integral curved plate section (24) profiled to fit the unit into the side wall opening of a cylindrical shade. The lower end is formed (13) to provide a pivot mounting onto a stand. Wires are inserted through the hollow section.
Patent DK-0720434-T3 (DK)
Inventor: STAVRIDIS IOANNIS
IPC: B01J20/20
Filed: 1994-06-27
Granted: 2002-04-22
Abstract: PCT No. PCT/GR94/00015 Sec. 371 Date May 24, 1996 Sec. 102(e) Date May 24, 1996 PCT Filed Jun. 27, 1994 PCT Pub. No. WO96/00019 PCT Pub. Date Jan. 4, 1996This invention refers to a method of withholding noxious compounds contained in cigarette smoke (NO, NOx, carcinogenic nitrosocompounds, free radicals, H2O2, CO, aldehydes, and trace elements) which were up to today insufficiently retained by conventional cigarette filters. The method described specifically refers to the enrichment of common convention filters with biological substances of the metal ions (Fe2+, Cu2+, Mg2+) complexed with porphirin ring as well as Fe2+ ions stereospecifically bound to protein molecules, either separately or in combinations. The enrichment of these conventional filters with the abovementioned biological substances alters neither the physical properties of the cigarette smoke (odor, taste and appearance) nor the physical properties of the filter itself.
Patent DK-0711154-T3 (DK)
Inventor: RUFF MICHAEL DAVID
IPC: A61K31/137
Filed: 1994-07-29
Granted: 2003-06-10
Abstract: PCT No. PCT/GB94/01642 Sec. 371 Date Mar. 22, 1996 Sec. 102(e) Date Mar. 22, 1996 PCT Filed Jul. 29, 1994 PCT Pub. No. WO95/03791 PCT Pub. Date Feb. 9, 1995This application discloses a method of inhibiting degradation of the antidepressant bupropion hydrochloride in a solid pharmaceutical formulation, so that the pharmaceutical formulation will maintain at least 80% of its initial bupropion potency after one year.
Patent DK-0681818-T3 (DK)
Inventor: GAMMER PETER
IPC: A61F2/72
Filed: 1995-04-08
Granted: 2000-09-18
Abstract: The process of muscle-electric control for an artificial limb involves performing electrical-muscle proportional control on the limb, e.g an artificial arm, driven by an electric motor by measuring the voltage signal of each electrode and sending the measured signal to a controller. The controller performs proportional speed adjustment in which the rotation speed nominated value related to the measured electrode voltage is calculated according to the nominated value related to different rotation speed of drive motor. The rotation speed nominated value is compared with the measured rotation speed of the motor and the difference is sent as an adjustment difference value to the proportional integral adjuster (PI-adjuster). In the PI-adjuster, the adjustment deviation of the corresponding adjustment parameter is converted into a pulse-width-modulation (PWM) signal to control the drive motor such that the rotation speed of the drive motor is proportional to the electrode voltage. The actual current of drive motor is measured and compared with a pre-specified maximum value and the adjuster is turned off when the maximum value is exceeded.
Patent DK-0709394-T3 (DK)
Inventor: HAMERSMA JOHANNES ANTONIUS MAR
IPC: C07J19/00
Filed: 1995-10-24
Granted: 2001-06-18
Abstract: A steroid with a 17-spiromethylene lactone group having formula I   <CHEM> wherein R1 is O, (H,H), (H,OR), or NOR, R being selected from H, (1-6C) alkyl and (1-6C) acyl; R2 is H, (1-6C) alkyl optionally substituted by a halogen, (2-6C) alkenyl optionally substituted by a halogen, (2-6C) alkynyl optionally substituted by a halogen, or halogen; R2' is H; or R2' together with R2 is a (1-6C) alkylidene group or a (2-6C) alkenylidene group; or R2' together with R3 is a bond; R3 is H if not together with R2' a bond; R4 is (1-6C) alkyl; one of R5 and R6 is hydrogen and the other is hydrogen or (1-6C) alkyl; X is (CH2)n or (CnH2n-2) wherein n is 2 or 3, which is optionally substituted with hydroxy, halogen, (1-6C) alkyl, (1-6C) acyl, (7-9C) phenylalkyl, the phenyl group of which may be substituted with (1-6C) alkyl, (1-6C) alkoxy, hydroxy or halogen; Y is O or (H,OH); and the dotted lines indicate optional bonds, at least one of bonds 4-5, 5-10, and 9-10 being a double bond. The steroids of the invention have progestational activity and can be used as contraceptives.
Patent DK-0685629-T3 (DK)
Inventor: BATLINER RAINER
IPC: E21B10/44
Filed: 1995-03-20
Granted: 2002-12-02
Abstract: The bit has a clamping shaft (1), a drill shaft (2) with at least four parallel adjacently arranged swarf grooves (4-7). A drill head (3) of hard metal is connected with the drill shaft with four peripherally distributed discharge grooves (8-11) running in the longitudinal direction of the drill head. The discharge grooves have a differently sized internal cross-section, that of two first diametrically opposed discharge grooves (8,10) being larger than that of two second diametrically opposed discharge grooves (9,11). The discharge grooves have a differently sized radial distance from the centre of the drill head. <IMAGE>
Patent DK-0735947-T3 (DK)
Inventor: KLING ROBERT
IPC: B29L31/48
Filed: 1994-12-21
Granted: 1999-11-01
Abstract: PCT No. PCT/SE94/01236 Sec. 371 Date Jun. 18, 1996 Sec. 102(e) Date Jun. 18, 1996 PCT Filed Dec. 21, 1994 PCT Pub. No. WO95/17296 PCT Pub. Date Jun. 29, 1995Elastic tapes consisting of non-weldable elastic warp threads and weldable thermoplastic weft threads, are fixed to one side of a cover layer of a disposable diaper by ultrasonic welding of the thermoplastic weft threads
Patent DK-0748157-T3 (DK)
Inventor: HARJU-JEANTY PONTUS
IPC: A01P13/00
Filed: 1995-02-28
Granted: 2000-04-17
Abstract: PCT No. PCT/FI95/00108 Sec. 371 Date Aug. 29, 1996 Sec. 102(e) Date Aug. 29, 1996 PCT Filed Feb. 28, 1995 PCT Pub. No. WO95/23505 PCT Pub. Date Sep. 8, 1995A production method for water-based pesticide composition in which a high power dispersing machine and the tearing mixer blade thereof are used for emulsifying oil. With the method of the invention, storage stability, mixability properties of the product, as well as economy are improved.
Patent DK-0728350-T3 (DK)
Inventor: DEJACO ANDREW P
IPC: G10L19/24
Filed: 1995-08-01
Granted: 2003-06-30
Abstract: A method of adding hangover frames to a plurality of frames encoded by a vocoder, the method comprising: detecting that a predefined number of successive frames has been encoded at a first rate; determining that a next successive frame should be encoded at a second rate that is less than the first rate; and selecting a number of successive hangover frames beginning with the next successive frame to encode at the first rate, the numbering dependent upon an estimate of a background noise level.
Patent DK-0842520-T3 (DK)
Inventor: TAMIC LUCIEN
IPC: H01G4/20
Filed: 1996-07-26
Granted: 2002-09-09
Abstract: PCT No. PCT/FR96/01189 Sec. 371 Date Jan. 29, 1998 Sec. 102(e) Date Jan. 29, 1998 PCT Filed Jun. 26, 1996 PCT Pub. No. WO97/05634 PCT Pub. Date Feb. 13, 1997A metallized polypropylene film that has a modulus of elasticity in bending higher than 1500 MPa, a sag point under load higher than 110 DEG  C., and a Vicat point higher than 150 DEG  C. The metallized film is a film for making a capacitor.
Patent DK-0805015-T3 (DK)
Inventor: SENSEN KLEMENS
IPC: B29C48/32
Filed: 1997-03-29
Granted: 2002-10-07
Abstract: The apparatus to lay a film tube flat, at the head of a film blowing machine, has a calibration unit (15) which rotates in the same direction as the flat laying plates (7).
Patent DK-0901506-T3 (DK)
Inventor: XU WAYNE
IPC: C08L3/02
Filed: 1997-05-13
Granted: 2004-02-02
Abstract: Biodegradable films include two biodegradable components. One component preferably is starch while the other component is a water insoluble, synthetic polymer, preferably a hydroxy-functional polyester.
Patent DK-0894498-T3 (DK)
Inventor: LIVINGSTON DAVID
IPC: G01N33/483
Filed: 1998-07-01
Granted: 2006-08-28
Abstract: A method for increasing the percentage of mammalian offspring of either sex which comprises contacting a semen sample with an antibody specific for the spermatozoa determinative of one sex and separating said spermatozoa from spermatozoa determinative of the other sex, said antibody being bound to a non-porous magnetic bead support having a diameter of 0.1 to 2 microns.
Patent DK-0991424-T3 (DK)
Inventor: CAREY FRANK
IPC: A61P27/02
Filed: 1998-07-02
Granted: 2001-12-03
Abstract: The invention relates to pharmaceutical compositions comprising an aldose reductase inhibitor and an ACE inhibitor, and their use in the treatment of diabetic complications such as diabetic neuropathy, diabetic retinopathy and diabetic nephropathy.
Patent DK-0976495-T3 (DK)
Inventor: HEESEMANN JUERGEN DIPL-ING
IPC: B24B21/06
Filed: 1999-07-21
Granted: 2003-07-21
Abstract: A belt grinding machine has a grinding belt continuously guided about at least two deflection rollers 2, a pressure shoe 3 that presses the grinding belt 1 against a workpiece 8 by a contact pressure apparatus. The belt grinding machine also has a contact pressure control that allows a contact pressure force to be set. The uniformity and reproducibility of the grinding results are improved by a detector arrangement 6, 7 that senses the adjustment of the pressure shoe 3 and an evaluation device that influences the contact pressure control as a function of the sensed adjustment of the pressure shoe 3.
Patent DK-1071103-T3 (DK)
Inventor: MACERINI SAURO
IPC: H01F27/28
Filed: 1999-07-23
Granted: 2009-01-19
Abstract: The electronic component comprises an electric winding, consisting of a plurality of conductive tracks (24) provided on a laminar support (22; 26) and of a plurality of half-turns (8), the ends of which are connected electrically to said conductive tracks (24) in order to form the winding. A ferro-magnetic core (15) is optionally disposed inside the winding.  <IMAGE>
Patent ES-2204448-T3 (ES)
Inventor: VAN DER BURG WILLIAM
IPC: A01G9/10
Filed: 2000-07-24
Granted: 2004-05-01
Abstract: Device (1) and method for inserting an information carrier (8) in a substrate (21). The information carriers (8) are stored in a storage (3) and with the aid of transfer means are removed one by one from said storage (3) with the aid of vacuum. The transfer means then place the information carrier (8) concerned in the insertion element (11), which then executes the insertion stroke.  <IMAGE>
Patent ES-2259999-T3 (ES)
Inventor: MARTELL MARTIN
IPC: B29C65/02
Filed: 2000-01-26
Granted: 2006-11-01
Abstract: The present invention relates to a counter rail and a dolly, suitable for use in an apparatus for heat sealing a laminated packaging material for packaging of a liquid or flowing product, wherein the counter rail and the dolly each are made of a substantially plastics material. The invention also relates to an apparatus for heat sealing and to a sealing/cutting apparatus including said counter rail and dolly, as well as to a packaging machine including such a sealing apparatus and counter rail and dolly of the invention. Furthermore, the invention relates to a method of producing said counter rail and dolly by means of co-injection molding.
Patent ES-2197083-T3 (ES)
Inventor: ENDLER INGOLF
IPC: C23C16/14
Filed: 2000-02-26
Granted: 2004-01-01
Abstract: The invention relates to a tool, especially a cutting insert for cutting metallic materials, which consist of a hard metal, cermet ceramics or steel base, especially of a high speed steel base, and at least one layer deposited thereon. The single layer, or in the case of several layers the outer layer or the layer underneath the outer layer, contains molybdenum sulfide. The aim of the invention is to improve the resistance to wear of the friction-reducing, molybdenum sulfide containing layer even at high pressures. To this end, the molybdenum sulfide containing layer consists of an alternating sequence of two layer that are different from one another. The first layer contains 51 to 100% by weight of metallic molybdenum and the second layer contains 21 to 100% by weight of MoS2 which substantially consists of hexagonal crystals that are at least substantially oriented in a plane parallel to the tool surface.
Patent ES-2290028-T3 (ES)
Title: Metodo para la conservacion de virus y micoplasma.
Inventor: WORRALL ERIC EDWARD
IPC: A61K39/17
Filed: 2000-05-03
Granted: 2008-02-16
Abstract: un método para conservar un material activo biológicamente que comprende un virus vivo o micoplasma, cuyo método comprende las etapas de: (i) mezclar una suspensión acuosa del material activo biológicamente con una solución acuosa estéril de trehalosa para dar una concentración de trehalosa en la mezcla en el intervalo del 2, 5 al 8% p/v; (ii) someter la mezcla a un secado primario, durante 30 a 60 minutos, a una presión menor que la presión atmosférica, en el que la temperatura de la mezcla inicialmente no es mayor de 37ºC, y que se controla para que no caiga a 0ºC o inferior, y que es finalmente no mayor de 40ºC, para formar una matriz porosa vítrea que comprende trehalosa vítrea que tiene un contenido de humedad residual no mayor del 10% y que contiene, dentro de la matriz, material activo biológicamente desecado; y (iii) someter la matriz porosa vítrea de la etapa (ii) a un secado secundario durante 10 a 30 horas a una presión no mayor de 0, 1 mbares y a una temperatura que está finalmente en el intervalo de 40 a 45ºC para formar una matriz de trehalosa que tiene un contenido de humedad residual no mayor del 2% que contiene, dentro de la matriz, material activo biológicamente desecado.
Patent ES-2263478-T3 (ES)
Title: Inhibidores de aspartil proteasa.
Inventor: HALE MICHAEL ROBIN
IPC: A61K/
Filed: 2000-06-08
Granted: 2006-12-16
Abstract: Un compuesto de la fórmula (II): (Ver fórmula) y sales farmacéuticamente aceptables del mismo; en el cual: A es R¿-C(O), en donde R¿ se selecciona de R1-alquilo C1-C6, (Ver fórmula) cada R1 es seleccionado independientemente de -C(O)-, -S(O)2-, -C(O)-C(O)-, -O-C(O)-, -O-S(O)2, -NR2-, -NR2-S (O)2-, NR2C(O)-o NR2C(O)C(O)cada Ht es seleccionado independientemente de cicloalquilo C3-C7, cicloalquenilo C5-C7, arilo C6-C14, o un heterociclo saturado o insaturado de 5-7 miembros, que contiene uno o más heteroátomos seleccionados de N, N(R2), O, S y S(O)n; en donde dicho arilo o dicho heterociclo está opcionalmente fusionado a Q; y en donde cualquier miembro de dicho Ht está opcionalmente substituido con uno o más substituyentes independientemente seleccionados de oxo, -OR2, SR2, -R2, -N(R2)(R2), -R2-OH, -CN, -CO2R2, -C(O)-N(R2)2, -S(O)2-N(R2)2, -N(R2)-C(O)-R2, -N(R2)-C(O)OR2, -C(O)-R2, -S(O)n-R2, -OCF3, -S(O)n-Q, metilendioxilo-N(R2)-S(O)2(R2), halo, -CF3, -NO2, Q, -OQ, -OR7, -SR7, -R7, -N(R2)(R7)o -N(R7)2; cada R2 es seleccionado independientemente de H, o alquilo C1-C4 opcionalmente substituido con un sistema anular carbocíclico saturado, parcialmente insaturado o insaturado de 3-7 miembros; o o un anillo heterocíclico saturado, parcialmente insaturado o insaturado de 5-7 miembros que contiene uno o más heteroátomos seleccionados de O, N, S, S(O)n o N(R33); en donde cualquiera de dichos sistemas anulares o N(R33) están opcionalmente substituidos con 1 a 4 substituyentes seleccionados independientemente de X¿-Y¿, -O-arilalquilo, -S-arilalquilo, -N(Y¿)2, -N(H)-arilalquilo, -N(alquil C1-C4)-arilalquilo, oxo, -O-(alquilo C1-C4), OH, alquilo C1-C4, -SO2H, -SO2-(alquilo C1-C4), -SO2-NH2, -SO2-NH (alquilo C1-C4), -SO2-N(alquilo C1-C4)2, -NH2, -NH(alquilo C1-C4), -N(alquilo C1-C4)2, -NH-C(O)H, -N (alquilo C1-C4)-C(O)H, -NH-C(O)-alquilo C1-C4, -alquilo C1-C4-OH, -OH, -CN, -C(O)OH, -C(O)O-alquilo C1-C4, -C (O)-NH2, -C(O)-NH(alquilo C1-C4), -C(O)-N(alquilo C1-C4)2, halo o -CF3; X¿ es -O-, -S-, -NH-, -NHC(O)-, -NHC(O)O-, -NHSO2-, o -N-alquilo C1-C4Y¿ es alquilo C1-C15, alquenilo o alquinilo C2-C15, en donde de uno a cinco átomos de carbono en Y¿ están substituidos opcionalmente con cicloalquilo C3-C7 o cicloalquenilo C5-C6, arilo C6-C14, o un heterociclo saturado o insaturado de 5-7 miembros, que contiene uno o más heteroátomos seleccionados de N, NH, O, S y S(O)n; cada R33 es seleccionado de H, alquilo C1-C6, alquenilo C2-C6, alquinilo C2-C6, cicloalquilo C3-C6 o cicloalquenilo C5-C6, arilo C6-C14, o un heterociclo saturado o insaturado de 5-7 miembros, que contiene uno o más heteroátomos seleccionados de N, NH, O, S y S(O)n.