3727492 -OEChem-02060822572D 0 0 0 0 0 0 0 0 0999 V2000 M END > 3727492 > 2 > ChemIDplus > 000550527 > (2S-trans)-18-Carboxy-8-ethenyl-13-ethyl-2,3-dihydro-3,7,12,17,20-pentamethyl-21H,23H-porphine-2-propanoic acid 21H,23H-Porphine-2-propanoic acid, 18-carboxy-8-ethenyl-13-ethyl-2,3-dihydro-3,7,12,17,20-pentamethyl-, (2S-trans)- 550-52-7 Chlorin E4 Copper-chlorin E4-disodium salt > 550-52-7 > 000550527 > http://chem.sis.nlm.nih.gov/chemidplus/ > http://chem.sis.nlm.nih.gov/chemidplus/direct.jsp?result=advanced®no=000550527 $$$$