148504-34-1 4',5'-Bis(N,N-bis(carboxymethyl)aminomethyl)fluorescein acetoxymethyl ester Calcein AM Glycine, N,N'-((3',6'-bis(acetyloxy)-3-oxospiro(isobenzofuran-1(3H),9'-(9H)xanthene)-2',7'-diyl)bis(methylene))bis(N-(2-((acetyloxy)methoxy)-2-oxoethyl)-, bis((acetyloxy)methyl) ester