| abstract |
The terms used in the specification have the following meanings: "Alkyl of 1 to 4 carbon atoms" indicates alkyl of 1 to 4 straight or branched chain carbon atoms, which may be methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, iso-butyl or tert-butyl. "Alkyl (1 to 4 carbon atoms) -amino" indicates amino substituted by alkyl of 1 to 4 carbon atoms as previously defined herein. ¿(Di-alkyl of 1 to 4 carbon atoms) amino? Indicates amino substituted by alkyl of 1 to 4 carbon atoms as previously defined herein. "Alkyl (1 to 4 carbon atoms) -sulfonyl" indicates sulfonyl substituted by alkyl of 1 to 4 carbon atoms as previously defined herein. "Halo-alkyl (from 1 to 4 carbon atoms)" indicates alkyl of 1 to 4 carbon atoms as defined hereinbefore substituted by one or more, preferably one, two or three halogen atoms, preferably fluorine or chlorine atoms . "Hydroxy-alkyl (from 1 to 4 carbon atoms)" indicates alkyl of 1 to 4 carbon atoms as defined hereinbefore substituted by one or more, preferably, one, two or three hydroxy groups. "Alkoxy of 1 to 4 carbon atoms" indicates alkoxy of 1 to 4 straight or branched chain carbon atoms and may be methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, sec-butoxy or tert-butoxy . "Alkoxy (from 1 to 4 carbon atoms) -carbonyl" indicates carbonyl substituted by alkoxy of 1 to 4 carbon atoms as previously defined herein and may be methoxy-, ethoxy-, n-propoxy-, isopropoxy-, n- butoxy-, isobutoxy-, secbutoxy- or tert-butoxycarbonyl. |