Patent ID: 7176216

Claim:
A compound represented by the formula: wherein R 1 is a group represented by the formula -G 1z -R 1z wherein G 1z is a single bond, oxygen or sulfur, and R 1z is methyl or ethyl or methoxymethyl; R 5 and R 6 are each independently hydrogen, t-butoxycarbonyl or a group represented by the formula -X 6b -X 7b wherein X 6b is methylene and X 7b is C 1-6 alkyl, C 3-8 cycloalkyl, tetrahydropyran-yl or tetrahydrofuran-yl; and wherein R 40 and R 42 are each independently C 1-6 alkoxy, and R 41 is a group represented by the formula: (wherein R 44 and R 45 are each independently hydrogen, methyl or ethyl; and R 43 is C 1-6 alkyl optionally substituted with 1 to 3 substituents selected from Substituent Group B below, wherein Substituent Group B is the group consisting of fluorine atom, chlorine atom, bromine atom, cyano, C 1-6 alkoxy, pyrrolidinyl, piperazinyl, piperidyl, morpholinyl, C 3-8 cycloalkyl, tetrahydropyran-yl and tetrahydrofuran-yl), a salt thereof or a hydrate of the foregoing.