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Pyrimido(5,4-g)pteridine-2,4,6,8-tetramine,4-methylbenzenesulfonate, base-hydrolyzed (Pigment Yellow 382E; CAS Reg. No. 346709-25-9), which is a mixture consisting of approximately 65.3 percent Pyrimido(5,4-g)pteridine-2,4,6,9-tetramine (CAS Reg. No. 207283-64-5), approximately 7.5 percent 2,6,8-triamino-pyrimido(5,4-g)pteridine-4(1H)-one (CAS Reg. No. 335356-94-0), approximately 16.7 percent 2,8-diamino-pyrimido(5,4-g)pteridine-4,6(1H, 7H)-dione (CAS Reg. No. 207283-72-5), and approximately 0.3 percent 8-amino-pyrimido(5,4-g)pteridine-2,4,6(1H,3H,7H)-trione (CAS Reg. No. 207283-92-9).