| 摘要 |
The invention is a compound of the formulawhereinR isa) -C(O)(CH2)nC(O)OH,b) wherein R1 is -N(R2)(R3), or is a five or six member aromatic or non-aromatic heterocyclic ring having one or more heteroatoms selected from nitrogen, oxygen or sulfur, unsubstituted or substituted by lower alkyl,c) -P(O)(OH)2, or isd) -C(O)(CH2)nNHC(O)(CH2)nN(R2)(R3); andR2/R3 are hydrogen or lower alkyl;n is 1, 2, 3 or 4;or a pharmaceutically acceptable acid addition salt thereof
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