A compound of formula (I) wherein n is 0 to 4； m is 0 or 1 with the proviso that the sulphuratom and R are in vicinal position (if m = 0 then R is in position2', and if m = 1 then R is on position 1')； R is ethyl or vinyl；R is hydrogen or (C)alkyl； R is hydrogenor - (C)cycloalkyl, or - unsubstituted (C)alkyl,or - (C)alkyl substituted by one or more of - hydroxy； preferablyone or two, - methoxy, - halogen, - (C)cycloalkyl, or RandR together with the nitrogen atom to which they are attached form a5 to 7 membered heterocyclic ring containing at least 1 nitrogen atom or 1 nitrogenand 1 additional heteroatome e. g. selected from N or O, or R is hydroxyand R is formyl； R is OH, OR, a halogen atom,or - with the proviso that R is bound to 2' R represents-O-(CH)-O- with p is 2 or 3； R is unsubstituted(C)alkyl or (C)cycloalkyl.
