[1] UNIV BRADFORD,SCH CHEM,BRADFORD BD7 1DP,W YORKSHIRE,ENGLAND
[2] ICI LTD,DIV PHARMACEUT,MICROBIAL METABOLITES GRP,MACCLESFIELD SK10 4TG,CHESHIRE,ENGLAND
[3] LIVERPOOL POLYTECH,DEPT BIOL,LIVERPOOL L3 3AF,ENGLAND
[4] UNIV OXFORD,CHEM CRYSTALLOG LAB,OXFORD OX1 3PD,ENGLAND