O-Cresolphthaleincomplexonetetrasodiumsalt

Tetrasodium;2-[[5-[1-[3-[[bis (carboxylatomethyl) amino]methyl]-4-hydroxy-5-methylphenyl]-3-oxo-2-benzofuran-1-yl]-2-hydroxy-3-methylphenyl]methyl- (carboxylatomethyl) amino]acetate

CC1=CC (=CC (=C1O) CN (CC (=O) [O-]) CC (=O) [O-]) C2 (C3=CC=CC=C3C (=O) O2) C4=CC (=C (C (=C4) C) O) CN (CC (=O) [O-]) CC (=O) [O-].[Na+].[Na+].[Na+].[Na+]