(m-((2,4,6-Triamino-5-pyrimidinyl)azo)phenyl)phosphonic acid 2877-67-0 5-25-18-00290 (Beilstein Handbook Reference) BRN 0329476 PY-83 Phosphonic acid, (m-((2,4,6-triamino-5-pyrimidinyl)azo)phenyl)-