Patent ID: 8569313

Claim:
A compound according to the formula (I) or a salt thereof, wherein R 1 is a singly or multiply substituted ring structure selected from: (i) an aryl residue, which may be partially or wholly hydrogenated, (ii) a heteroaryl residue, which may be partially or wholly hydrogenated, (iii) a non-hydrogenated aryl residue, (iv) a non-hydrogenated heteroaryl residue, (v) a heteroaryl residue with one or two nitrogen atoms, (vi) a phenyl residue, (vii) a pyridyl residue, (viii) a pyrimidine residue, (ix) an indole residue, (x) a tetrahydropyridyl residue, (xi) a piperidinon residue, or (xii) a pyridazinone residue; and R 2 and R 2 ′ are each independently: (i) a ramified or straight chain alkyl residue having 1-6 carbon atoms, wherein one or more methylene groups may be replaced by oxygen or nitrogen, (ii) a ramified or straight chain amino alkyl residue having 1-6 carbon atoms, (iii) a ramified or straight chain guanidine alkyl residue having 1-6 carbon atoms, (iv) —(CH 2 ) m —C(═O)—NHR 4 where m equals a whole number from 0 to 4 and R 4 is a hydrogen or a —(CH 2 ) k —CH 3 residue where k equals a whole number from 0 to 3, or (v) R 2 and R 2 ′ together form a ring structure with the piperidide selected from the group consisting of: or R 1 is: (i) a ramified or straight chain hydroxy alkyl residue having 1 to 6 carbon atoms, (ii) a straight chain aminoalkyl residue, (iii) a 3-azetidin-C(═O)—NH-residue, or (iv) an unramified n-amino butyl residue; and R 2 and R 2 ′ are each independently: (i) a ramified or straight chain aminoalkyl residue having 1-6 carbon atoms, (ii) a ramified or straight chain guanidino alkyl residue having 1-6 carbon atoms, (iii) a straight chain amino ethyl residue, or (iv) R 2 is —(CH 2 ) m —C(═O)—NHR 4 where m equals a whole number from 0 to 4, and R 4 is a hydrogen or a —(CH 2 ) k —CH 3 residue where k equals a whole number from 0 to 3; or R 1 is: (i) a H 2 N—(CH 2 ) n —C(═O)—NH-residue where n equals a whole number from 1 to 4, (ii) a HO—(CH 2 ) n —C(═O)—NH-residue where n equals a whole number from 1 to 4, or (iii) a 3-azetidin-C(═O)—NH-residue; and R 2 and R 2 ′ are: (i) each independently a non-basic residue, (ii) R 2 is —(CH 2 ) m —C(═O)—NHR 4 where m equals a whole number from 0 to 4, and R 4 is a hydrogen or a —(CH 2 ) k —CH 3 residue where k equals a whole number from 0 to 3, and R 2 ′ is a non-basic residue, (iii) R 2 is —(CH 2 ) o —C(═O)—OR 5 where o is a whole number from 1 to 6 and R 5 is a hydrogen or a ramified or straight chain alkyl group with 1 to 4 carbon atoms, and R 2 ′ is a non-basic residue, or (iv) R 2 and R 2 ′ together form a ring structure with the piperidide selected from the group consisting of: and R 3 is selected from the group consisting of a hydrogen, a hydroxyl group, an alkoxy group, an acetyloxy group and an alkyloxycarbonyl group, whereby the alkyl residue contains 1-6 carbon atoms.