Patent ID: 8163773

Claim:
A compound of the formula I wherein R1 is hydrogen, unsubstituted or substituted alkyl, unsubstituted or substituted alkenyl, unsubstituted or substituted alkynyl, unsubstituted or substituted aryl, unsubstituted or substituted heterocyclyl or unsubstituted or substituted cycloalkyl; R2 is phenyl-C 1 -C 7 -alkyl, naphthyl-C 1 -C 7 -alkyl, di-(phenyl)-C 1 -C 7 -alkyl, indanyl-C 1 -C 7 -alkyl, (phenyl-C 3 -C 8 -cycloalkyl)-C 1 -C 7 -alkyl, (phenyl)-(pyridyl)-C 1 -C 7 -alkyl, indolyl-C 1 -C 7 -alkyl, 4H-benzo[1,4]oxazin-3-on-yl, (C 1 -C 7 -alkoxy)-di(phenyl)-C 1 -C 7 -alkyl or (C 1 -C 7 -alkoxycarbonyl)-di-(phenyl)-C 1 -C 7 -alkyl where each phenyl, naphthyl, pyridyl, indolyl or 4H-benzo[1,4]oxazin-3-on-yl mentioned for R2 is unsubstituted or substituted by one to three, moieties independently selected from the group consisting of C 1 -C 7 -alkyl, C 1 -C 7 alkoxy-C 1 -C 7 -alkyl, phenyl, halo, hydroxy, C 1 -C 7 -alkoxy and C 1 -C 7 -alkoxy-C 1 -C 7 -alkoxy; R3 is hydrogen, unsubstituted or substituted aryl or unsubstituted or substituted alkyl, R4 is unsubstituted or substituted alkyl, unsubstituted or substituted alkenyl, unsubstituted or substituted alkynyl, unsubstituted or substituted aryl, unsubstituted or substituted heterocyclyl, unsubstituted or substituted cycloalkyl, or acyl; T is methylene or carbonyl; or a salt thereof.