JOURNAL OF NATURAL PRODUCTS, v.66, no.4, pp.566 - 568, 2003
TETRAHEDRON, v.58, no.47, pp.9585 - 9591, 2002
JOURNAL OF NATURAL PRODUCTS, v.64, no.6, pp.767 - 771, 2001
TETRAHEDRON LETTERS, v.42, no.16, pp.3005 - 3007, 2001
TETRAHEDRON LETTERS, v.42, no.10, pp.1965 - 1968, 2001