Synonyms: Tin,[ethyl3,4,20,21-tetradehydro-4,9,14,19-tetraethyl-18,19-dihydro-3,8,13,18-tetramethyl-20-phorbinecarboxylato(2-)-N23,N24,N25,N26]-,(SP-4-2)-; 20-Phorbinecarboxylic acid,3,4,20,21-tetradehydro-4,9,14,19-tetraethyl-18,19-dihydro-3,8,13,18-tetramethyl-,ethyl ester, tin complex; Phorbine, tin deriv.; Tin etiopurpurin