3-[(10Z,14Z,20Z,22S,23S)-17-ethenyl-12-ethyl-13,18,22,27-tetramethyl-3,5-dioxo-4-oxa-8,24,25,26-tetraazahexacyclo[19.2.1.1^6,9.1^11,14.1^16,19.0^2,7]heptacosa-1(24),2(7),6(27),8,10,12,14,16,18,20-decaen-23-yl]propanoic acid (non-preferred name)

(17S-trans)-18-(2-Carboxyethyl)-12-ethenyl-7-ethyl-17,18-dihydro-3,8,13,17-tetramethyl-21H,23H-porphine-2,20-dicarboxylic acid cyclic 2,20-anhydride

Purpurin 18

3-[(10Z,14Z,20Z,22S,23S)-17-ethenyl-12-ethyl-13,18,22,27-tetramethyl-3,5-dioxo-4-oxa-8,24,25,26-tetraazahexacyclo[19.2.1.1^6,9.1^11,14.1^16,19.0^2,7]heptacosa-1(24),2(7),6(27),8,10,12,14,16,18,20-decaen-23-yl]propanoic acid (non-preferred name)

3-[(10Z,14Z,20Z,22S,23S)-17-ethenyl-12-ethyl-13,18,22,27-tetramethyl-3,5-dioxo-4-oxa-8,24,25,26-tetraazahexacyclo[19.2.1.1^6,9.1^11,14.1^16,19.0^2,7]heptacosa-1(24),2(7),6(27),8,10,12,14,16,18,20-decaen-23-yl]propanoic acid (non