1. Department of Chemistry, Umeå University, SE 901 87 Umeå, Sweden, Umetrics, Tvistevägen 48, P.O. Box 7960, SE 90719, Umeå, Sweden, Umeå Plant Science Center, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, SE-901 87 Umeå, Sweden, and AstraZeneca R&D, SE 43183 Mölndal, Sweden