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en r 1 ,r 2 ,r 3 ,r 4 yr 7 cuando representan alquiltio o alquilsulfinilo el alquilo es preferiblemente un alquilo inferior que tiene 1-4 átomos de carbono especialmente preferidos, por ejemplo, metiltio, metil -sulfinilo, etiltio, etilsulfinilo, isopropiltio, n-butil -sulfinilo o isobutiltio.
1 2 3 4 7 in r , r , r , r and r when representing alkylthio or alkylsulfinyl is the alkyl preferably a lower alkyl having especially preferred 1-4 carbon atoms, e.g. methylthio, methylsulfinyl, ethylthio, ethylsulfinyl, isopropylthio, n-butylsulfinyl or isobutylthio.