M. Joardar

Nudol, a phenanthrene of the orchids Eulophia nuda, Eria carinata and Eria stricta

S. Bhandari, A. H. Kapadi, P. L. Mujumder, 1985 .

Cirrhopetalanthrin, a dimeric phenanthrene derivative from the orchid Cirrhopetalum maculosum

M. Joardar, A. Pal, P. Majumder, 1990 .