Patent ID: 6903226
Filing Date: 2005-06-07
Classification: C07D,C09B,Y02P

Abstract:
1. A compound represented by general formula (IB) or a salt thereof: wherein R wherein X 1 , X 2 , X 3 , and X 4 independently represent a hydrogen atom, an alkyl group, a 2-pyridylmethyl group, or a protective group for an amino group, and m and n independently represent 0 or 1, provided that R 1 and R 2 do not simultaneously represent hydrogen atoms; R 3 and R 4 independently represent a hydrogen atom or a halogen atom; represents a hydrogen atom, an alkylcarbonyl group, or an alkylcarbonyloxymethyl group, and R 7 represents a hydrogen atom or an alkyl group.