139781-09-2 5,5-Bis(4-pyridinylmethyl)-5H-cyclopenta(2,1-b:3,4-b')dipyridine monohydrate 5H-Cyclopenta(2,1-b:3,4-b')dipyridine, 5,5-bis(4-pyridinylmethyl)-, monohydrate DuP 921 Sibopirdine Sibopirdine [USAN:INN]