by Grass, J P, Dockendorff, I B, Soto, V A, Araya, P H, Henriquez, C M
Published in Spine (Philadelphia, Pa. 1976) (01.03.1993)

by MIGNANI, G, GRASS, JP, CHABARDES, P, MOREL, D
Published in Tetrahedron letters (1992)

by Grass, P J, Soto, A V, Araya, H P
Published in Spine (Philadelphia, Pa. 1976) (15.08.1997)