本发明涉及式（I）化合物及其药用活性盐，其中R1是氢、低级烷基或苄基，其可任选地被卤素或低级烷氧基取代；
The present invention relates to compounds of formula (I) wherein R1 is hydrogen, lower alkyl or benzyl which may be optionally substituted by halogen or lower alkoxy;
本发明涉及式（I）化合物及其药用活性盐，其中R1是氢、低级烷基或苄基，其可任选地被卤素或低级烷氧基取代；
The present invention relates to compounds of formula (I) wherein R1 is hydrogen, lower alkyl or benzyl which may be optionally substituted by halogen or lower alkoxy;
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