Mycorrhizin a and chloromycorrhizin a,two antibiotics from a mycorrhizal fungus of monotropa hypopitys L.

Two new compounds, mycorrhizin A and chloromycorrhizin A, have been isolated from a mycorrhizal fungus of Monotropa hypopitys, L. and their structures established as 1(S), 6(S),9(R) - 6 - hydroxy - 8,8 - dimethyl - 4 - (1 - chloro - prop -1 - enyl) - tricyclo4.4.0.0^1.9] - 7 - oxa - dec - 3 - ene - 2,5 - dione and its 3-chloro derivative. Several derivatives were prepared and characterized.