1,5-DIOXA-9-AZASPIRO(5.5)UNDECANE, 9-(2,6-DIAMINO-4-PYRIMIDINYL)-, 1'-OXIDE 83540-23-2 9-(2,6-Diamino-4-pyrimidinyl)-1,5-dioxa-9-azaspiro(5.5)undecane 1'-oxide