5'-d[G*C*G*T*T*T*G*C*T*C*T*T*C*T*T*C*T*T*G*C*G*]-3' 5-SpG SpC SpG SpT spT SpT spG spC spT spC spT spT spC spT spT spC spT spT spG spC spG-3' AIDS-070974 AIDS070974 Formivirsen sodium ISIS 2922