| abstract |
A compound represented by the formula (I): wherein R 1 is hydrogen, a methyl group, an isopropyl group, an isobutyl group, a cyclohexyl group, a secondary butyl group, a benzyl group or a phenyl group; R2 is hydrogen or a methyl group; and R3 is each X is, independently -OH, OMethyl, OEthyl, OBenzyl, OnButyl, Ofhenyl, Methyl, Isopropyl, Butyl, phenyl, N (CH3) 2, C (O) NH2, F, Cl, n is 1 or 2 ; or a pharmaceutically acceptable salt thereof. |