Inclusion of the higher order coupling term in eq 3' is not justified in this system. It appears to contribute less than 1 % to the values of T,.(1 1) These are average internuclear separations, r,, and are related to the equilibrium values, re, by r, = re -I-( Az) where ( Az) is the anharmonicity correction.

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The structures of two new bitter triterpenes, ganoderic acid A and B. isolated from a mushroom Ganoderma lucidum (FR.) Karst. (Polyporaceae) were determined as 1 and 2 on the basis of spectral data. Ganoderic acid A is a novel highly oxidized triterpene bearing a boat‐shaped A‐ring of lanostane.

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