[1] Univ Manchester, Sch Chem, Manchester M13 9PL, Lancs, England
[2] Hungarian Acad Sci, Inst Organ Chem, H-1025 Budapest, Hungary
[3] Univ Durham, Dept Chem, Durham DH1 3LE, England
[4] Manchester Inst Biotechnol, Manchester M1 7DN, Lancs, England
[5] Univ Copenhagen, Dept Food Sci, DK-1958 Frederiksberg C, Denmark
[6] Agilent Technol R&D, D-76337 Waldbronn, Germany