(sp-4-2-(2s-trans))-trihydrogen

magnesate(3-),(18-carboxy-20-(carboxymethyl)-8-ethenyl-13-ethyl-2,3-dihydro-3,

7,12,17-tetramethyl-21h,23h-porphine-2-propanoato(5-)-n(21),n(22),n(23),n(24))