Pigment Yellow 1 Chemical Name PIGMENT YELLOW 1 C.I. No. 11680 CAS No. 2512-29-0 Synonyms Fast Yellow G,Fast Yellow G,Pigment Yellow G,Fastusol P Yellow 43L,iragon Yellow PYEl-L,Unisperse Yellow G-P Molecular Formula C17H16N4O4 Molecular Weight 340.33