Penentuan struktur molekul derivat kumarin dari kulit batang Calophyllum biflorum Hend.& Ws. dan pengaruhnya terhadap pertumbuhan In vivo tumor kelenjar susu mencit C3H = Determination of molecular structure of coumarin derivate from the stem bark of calophyllum bif lorum Hend.& Ws. and it's effect on the in vivo growth of c3h mammary tumor cells