Photoresist Chemicals 2-Naphthalenesulfonic acid, 7-[(3-chloro-2-hydroxypropyl)amino]-4-hydroxy-3-[2-(2-methyl-1-phenyl- 1H-benzimidazol-5-yl)diazenyl]- Cas:924277-68-9 Molecular Formula:C27H24ClN5O5S