Patent ID: 7625947

Claim:
A compound of the formula I wherein R 1 , R 2 , R 3 , R 4 and R 5 are: R 1 ═OCOCH 2 Cl, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═5′-O-methylgalloyloxy, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═OCOCH 2 CH 2 COOH, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═8′,9′-Dihydro-4′-hydroxycinnamoyloxy, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═4′-Hydroxycinnamoyloxy, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═3′,4′-Dimethoxycinnamoyloxy, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═3′,4′-Dihydroxy-5′-methoxycinnamoyloxy, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═OCOCH 2 NH(tert-BOC), R 2 ═H, R 3 ═COOCH 3 , R 4 and R 5 ═O; R 1 ═OCOCH 2 NH 2 HCl, R 2 ═H, R 3 ═COOH, R 4 and R 5 ═O; R 1 ═OCOCH(CH 3 )NH 2 HCl, R 2 ═H, R 3 ═COOH, —R 4 and R 5 ═O; R 1 ═H, R 2 ═Br, R 3 ═COOCH 3 , R 4 and R 5 ═O; R 1 ═CN, R 2 ═H, R 3 ═COOCH 3 , R 4 and R 5 ═O; R 1 ═SH, R 2 ═H, R 3 ═COOCH 3 , R 4 and R 5 ═O; R 1 and R 2 ═N(OH), R 3 ═COOCH 3 , R 4 and R 4 ═O; R 1 and R 2 ═OCOCH 3 , R 3 ═H, R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═COOCH 2 CH 2 N(CH 3 ) 2 , R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CONH 2 , R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CONHNH 2 , R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CONHCH 2 CH 2 NH 2 , R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CONHCH 2 CH 2 OH, R 4 and R 5 R 4 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CON(CH 2 CH 2 ) 2 NH, R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═NCO, R 4 and R 5 ═O; R 1 ═OCOCH 3 , R 2 ═H, R 3 ═NH 2 , R 4 and R 5 ═O; or R 1 ═OCOCH 3 , R 2 ═H, R 3 ═CN, R 4 and R 5 ═O;