two of the porphyrins were identified as tris- ( 2-carboxyethyl ) -carboxymethyl ethyl trimethyl porphin ( isocoproporphyrin ) and tris- ( 2-carboxyethyl ) -carboxymethyl trimethyl porphin ( de-ethyliso-coproporphyrin ) .
C0032712
porphyrins
C0009988
coproporphyrin