| abstract |
The present invention concerns a compound of formula (I): wherein R1 is C1-4 alkyl, or benzyl optionally substituted by halogen, C1-4 alkyl (optionally substituted by halogen or C1-4 alkoxy), C1-4 alkoxy, C1-4 alkoxycarbonyl, nitro or cyano; and a process for preparing a compound of formula (I). |