- Disposition and Excretion of C-14-AHTN (7-Acetyl-1,1,3,4,4,6-Hexamethyl-1,2,3,4-Tetrahydronaphthalene) and C-14-HHCB (1,3,4,6,7,8-Hexahydro-4,6,6,7,8,8-Hexamethyl-Cyclopenta-Gamma-2-Benzopy ran) After Intravenous Administration to Sprague-Dawley Rats and Domestic Pigs