1. Carbohydrate Chemistry Team, Industrial Research Limited, P O Box 31310, Lower Hutt, New Zealand, Department of Biochemistry, Albert Einstein College of Medicine of Yeshiva University, 1300 Morris Park Avenue, Bronx, New York 10461, Chemistry, M313, School of Biomedical, Biomolecular and Chemical Sciences, University of Western Australia, Crawley 6006, Australia