100311-01-1 4-25-00-04674 (Beilstein Handbook Reference) BRN 0329542 Benzenearsonic acid, p-((2,4,6-triamino-5-pyrimidinyl)azo)- PY-81 p-((2,4,6-Triamino-5-pyrimidinyl)azo)benzenearsonic acid