tokens: These effects were similar to those induced by diazepam , whereas the partial agonist Ro 16 - 6028 ( tert - butyl - ( S ) - 8 - bromo - 11 , 12 , 13 , 13a - tetrahydro - 9 - oxo - 9H - imidazo [ 1 , 5 - a ] - pyrrolo - [ 2 , 1 - c ] [ 1 , 4 ] benzodiazepine - 1 - carboxylate ) showed very weak efficacy in these biochemical tests .