1111-21-3 2,7,12,17-Porphinetetrapropionic acid, 3,8,13,18-tetramethyl- (VAN) (8CI) 21H,23H-Porphine-2,7,12,17-tetrapropanoic acid, 3,8,13,18-tetramethyl- 21H,23H-Porphine-2,7,12,17-tetrapropanoic acid, 3,8,13,18-tetramethyl- (VAN) (9CI) 3,8,13,18-Tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropionic acid 531-14-6 Coproporphyrin I EINECS 208-502-3 NSC 267073