| abstract |
Products of formula (I), wherein R1 is particularly an alkyl, alkylthio and alkoxy radical; R2 is e.g. a halogen atom or radicals -S-R, -O-R and (a), where R may be an alkyl or alkenyl radical; R3 is a radical (b), where X is an oxygen or sulphur atom; and R4 is particularly an optionally substituted guanidinosulphonyl radical. |