| abstract |
A compound of formula (See formula) wherein A) R1 is unsubstituted aryl (C6-18), or aryl (C6-18) substituted by aminocarbonyl, halogen or halo (C1-6) alkyl, R2 is alkoxycarbonyl (C1- 12), (C1-6) alkylcarbonyl, (C3-6) cycloalkyl (C1-6) alkylcarbonyl or unsubstituted (C6-18) aryl, or (C6-18) aryl substituted by aminocarbonyl, halogen or halo (C1-) alkyl 6), R3 and R5 are both (C1-4) alkylene, and R4 is hydrogen; OB) R1 is unsubstituted aryl (C6-18), or (C6-18) aryl substituted by aminocarbonyl, halogen or halo (C1-6) alkyl, R2 is alkoxycarbonyl (C1-12), cycloalkyl (C3-6) alkylcarbonyl (C1-6), unsubstituted aryl (C6-18), or aryl (C6-18) substituted by aminocarbonyl, halogen or halo (C1-6) alkyl, and R3, R4 and R5 are hydrogen. |