PCT No. PCT/GB93/00940 Sec. 371 Date Nov. 30, 1994 Sec. 102(e) Date Nov. 30, 1994 PCT Filed May 6, 1993 PCT Pub. No. WO93/24451 PCT Pub. Date Dec. 9, 1993A salt of formula (I) where X denotes a group of formula (II), Y denotes a group of formula (III) and R denotes the residue of an aliphatic or cycloaliphatic sulphonic acid having at least 3 carbon atoms after removal of an -SO3H group therefrom.
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