four solvents , propylene glycol ( pg ) , ethanol ( et ) , isopropanol ( ipa ) , and isopropyl myristate ( ipm ) , were employed as vehicles , in combination with four enhancers , 1-farnesylazacycloheptan-2-one ( 7fu ) , 1-geranylazacycloheptan-2-one ( 7gu ) , 1-geranylazacyclopentan-2-one ( 5gu ) , and 1-dodecylazacycloheptan-2-one ( azone ) .
C0001962
ethanol
C0022237
isopropanol