103428-20-2 21H,23H-Porphine-7-propanoic acid, 13-acetyl-3-carboxy-5-(carboxymethyl)-18-ethyl-7,8,17,18-tetrahydro-2,8,12,17-tetramethyl-, (7S-(7alpha,8beta,17beta,18alpha))- Bacteriochlorin a