Doxofylline Impurity 8 Catalogue D349278 CAS 5614-53-9 M.W 222.20 M.F C9H10N4O3 Specifications FAQs 2-(1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl) acetaldehyde