Calcein AM Glycine, N,N'-[[3',6'-bis(acetyloxy)-3-oxospiro[isobenzo furan-1(3H),9'-[9H]xanthene]-2'7'-diyl]bis(methylene)] bis[N-[2-[(acetyloxy)methoxy]-2-oxoethyl]-, bis[(acetyloxy)methyl] ester NSC689290