| 摘要 |
Compounds of the formula (I): <CHEM> and acid addition salts and salted esters thereof: wherein R<0> is an optionally substituted C1-12 hydrocarbon group; R<1> is a group of NR<3>R<4>; R<2> is hyrdrogen or a group R, or NR<5>R<6>; R is an optionally substituted hydrocarbon or heterocyclic group; R<3> is hydrogen or a group R or OR; R<4>, R<5> and R<6> are independently hydrogen or a group R; or R<3> and R<4>, R<5> and R<6>, or R<1> and R<2> may be joined to form a heterocyclic ring.
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