(R)-8-Bromoguanosine cyclic 3',5'-(hydrogen phosphorothioate) 150418-07-8 8-Br-Cgmps 8-Bromoguanosino-3',5'-cyclic monophosphorothioate Guanosine, 8-bromo-, cyclic 3',5'-(hydrogen phosphorothioate), (R)- Rp-8-Br-Cgmps