1,5-Dimethyl-2,3,6,7-tetrahydro-1H,5H-biscyclopentapyrazine 1,5-Dtbcp 72438-09-6 Dicyclopenta(b,e)pyrazine, 1,2,3,5,6,7-hexahydro-1,5-dimethyl-, trans- trans-1,5-Dimethyl-2,3,6,7-tetrahydro-1H,5H-biscyclopentapyrazine