摘要 |
Compounds are provided which have formula (I) wherein R is (II), (III), (IV) or (V), wherein R<7>, R<8>, R<9>, R<10> and R<11> are each, independently, hydrogen, halogen, or lower alkyl of 1-6 carbon atoms; R<1> and R<12> are each, independently, hydrogen or lower alkyl of 1-6 carbon atoms; and R<2>, R<3>, R<4>, R<5> and R<6> are each, independently, hydrogen, halogen or lower alkyl of 1-6 carbon atoms; or a pharmaceutically acceptable salt thereof. |