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Synthesis octyl p -methoxycinnamate substance as sunblock, has been done by transesterification reaction. The starting material of the reaction was ethyl p -methoxycinnamate isolated from Kaempferia galanga L . The transesterification reaction was carried out by reacting  ethyl p -methoxycinnamate with octanol. The product was identified by UV-VIS,Infra Red and Mass Spectroscopy. The result of measurements on erythemic %T at various concentrations demonstrate that octyl p-methoxycinnamate is applicable as a sunblock compound. Keywords: octyl p -methoxycinnamate, transesterification, ethyl p -methoxycinnamate, sunblock

Synthesis Octyl P-Methoxycinnamate as Sunblock by Transesterification Reaction with the Starting Material Ethyl P- Methoxycinnamate