| http://www.w3.org/ns/prov#value | - re each sulphur, CHNO.sub.2 or NY wherein Y is hydrogen, hydroxy, lower alkyl, cyano, CONH.sub.2 or SO.sub.2 R.sub.3 ; R.sub.3 is lower alkyl, substituted or unsubstituted aryl, preferably phenyl or tolyl, trifluoromethylor amino; W is NH, and when X.sub.1 and X.sub.2 are NH W may also be sulphur; and q is an integer from 2 to 8; or a pharmaceutically acceptable acid addition salt thereof.It will
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