1,1-Dichloro-1,1a,6,6a-tetrahydrobenzo[b]cyclopropa[d]biphenylen-6-yl methyl ether 1,1-Dichloro-6-methoxy-1,1a,6,6a-tetrahydrobenzo[b]cyclopropa[d]biphenylene AIDS-126696 AIDS126696 NSC122526