Calcein AM. A fluorescent dye, Synonyms: 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, Purity: G95%, CAS Number: 148504-34-1, 50ug.