66421-14-5 6H-Purin-6-one, 2-amino-1,7-dihydro-7-(7,8,9,10-tetrahydro-7,8,9-trihydroxybenzo(a)pyran-10-yl)- 7-(7,8,9-Trihydroxy-7,8,9,10-tetrahydrobenzo(a)-pyren-10-yl)guanine 7-Bpde-gua