Pigment Red 21

product Name Pigment Red 21 Synonyms 12300; C.I.PigmentRed21; 4-[(2-chlorophenyl)azo]-3-hydroxy-N-phenyl-2-Naphthalenecarboxamide(4Z)-4-[2-(2-chlorophenyl)hydrazinylidene]-3-oxo-N-phenyl-3,4-dihydronaphthalene-2-carboxamide Molecular Formula C23H16ClN3O2 Molecular Weight 401.845 InChI InChI=1/C23H16ClN3O2/c24-19-12-6-7-13-20(19)26-27-21-17-11-5-4-8-15(17)14-18(22(21)28)23(29)25-16-9-2-1-3-10-16/h1-14,26H,(H,25,29)/b27-21- CAS Registry Number 6410-26-0 EINECS 229-096-4 Molecular Structure Density 1.311g/cm3 Refractive index 1.665

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