a new porphyrin isolated from calf and foal meconium has been characterized as a tris- ( 2-carboxyethyl ) -mono- ( 2-carboxyvinyl ) -tetramethyl porphin , that is as an analogue of coproporphyrin in which one propionate group has been replaced by an acrylate group .
C0032712
porphyrin
C0009988
coproporphyrin