1,7-Dimethyl-2,3,6,7-tetrahydro-1H,5H-biscyclopentapyrazine 1,7-Dtbcp 72438-07-4 Cyclopenta(b,e)pyrazine, 1,2,3,5,6,7-hexahydro-1,7-dimethyl-, cis- cis-1,7-Dimethyl-2,3,6,7-tetrahydro-1H,5H-biscyclopentapyrazine