Patent ID: 7345049

Claim:
A phenylalanine compound of the following formula (1) or pharmaceutically acceptable salts thereof: wherein R11 represents a hydroxyl group, an alkoxyl group having 1 to 6 carbon atoms which may have a substituent(s), a morpholinoethyloxy group or a benzyloxy group which may be substituted with one or more methyl groups or one or more methoxy groups, R12 and R13 each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an acetyl group or methyloxycarbonyl group, or N(R12)R13 represents 1-pyrrolidinyl group, 1-piperidinyl group, 4-morpholinyl group, 4-thiomorpholinyl group, 3-tetrahydrothiazolyl group or 1-piperazinyl group of which the fourth position may be substituted with an alkyl group having 1 to 3 carbon atoms, R14 represents a methyl group or an ethyl group, R 1 ′ represents a hydrogen atom, a fluorine atom or a chlorine atom, X 1 represents —CH(R1a)-, —CH(R1a)CH(R1b)-, —CH(R1a)CH(R1b)CH(R1c)-, —CH(R1a)CH(R1b)CH(R1c)CH(R1d)-, —N(R1a)CH(R1b)CH(R1c)—, —OCH(R1a)CH(R1b)-, —OCH(R1a)CH(R1b)CH(R1c)- or 1,3-pyrrolidinylene, wherein R1a, R1b, R1c and R1d each independently represent a hydrogen atom or a methyl group, and Y 11 and Y 12 represent either one of the combinations, (Cl, Cl), (Cl, Me), (Cl, F), (F, F) and (F, Me).