L-Aspartic acid, N-[[(3',6'-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-6-yl)amino]thioxomethyl]-L-tyrosyl-L-valyl-L-alanyl-
L-Aspartic acid, N-[[(3',6'-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9'-[9H]xanthen]-6-yl)amino]thioxomethyl]-L-tyrosyl-L-valyl-L-alanyl-