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To develop effective and safe penetration enhancers, a series of l-carvyl esters, namely, 5-isopropenyl-2-methylcyclohex-2-en-1-yl heptanoate (C-HEP), 5-isopropenyl-2- methylcyclohex-2-en-1-yl octanoate (C-OCT), 5-isopropenyl-2-methylcyclohex-2-en-1-yl decanoate (C-DEC), 5-isopropenyl-2-methylcyclohex-2-en-1-yl dodecanoate (C-DOD), 5-isopropenyl-2-methylcyclohex-2-en-1-yl tetradecanoate (C-TET), and 5-isopropenyl-2-methylcyclohex-2-en-1-yl palmitate (C-PAL), was synthesized from l-carveol and saturated fatty acids (C7-C16). The volatility of l-carveol and l-carvyl esters was evaluated by a live weight loss experiment. The enhancing effects of l-carvyl esters on 5-fluorouracil (FU) were investigated in the in vitro permeation experiment on rat skin. The stratum corneum (SC) uptakes of the enhancers were tested in vitro by gas chromatography. Only the l-carvyl esters with a moderate SC uptake, namely, C-OCT (C8), C-DEC (C10), and C-DOD (C12), showed a potential to enhance FU skin permeation. An evident parabolic relationship was found between the permeation enhancement of FU and the SC uptake of the l-carvyl esters. The l-carvyl esters with a chain length of C8-C12 seemed to be favorable for FU.

l-Carvyl Esters as Penetration Enhancers for the Transdermal Delivery of 5-Fluorouracil