Figure 5
The core structures for database survey; (a) 8-methyl-1-aza-6-oxatricyclo[8.3.0.05,9]tridecane, and its (b) −13-one and (c) 7-(3-methyl-2-oxo-oxolan-3-en-5-ylidene) derivatives. Structures of the title compound and (–)-stemoamide are also shown for comparison. |