... (10) For the chemistry of (allenylmethyl ... 0002-7863/94/ 1516-4081$04.50/0 0 1994 American Chemical Society ... This material is contained in many libraries on microfiche, immediately follows this article in the microfilm version of the journal, and can be ordered from the ACS; see ...
![(2R,2aR,2a1R,3aR,4S,5aR)-2a1-((benzoyloxy)methyl)-4-methyl-3a-(prop-1-en-2-yl)hexahydro-2H-1,5-dioxa-2,4-methanocyclobuta[cd]pentalene-2-carboxylic acid结构式](https://image.chemsrc.com/caspic/401/154854-74-7.png)
![(1R,3R,4R,6S,9S)-methyl 4-((R)-2-methoxy-2-phenylacetoxy)-6-methyl-1-(prop-1-en-2-yl)-7-oxatricyclo[4.3.0.03,9]nonane-9-carboxylate结构式](https://image.chemsrc.com/caspic/053/154854-70-3.png)
![((1aR,1a1R,2S,3aR,5S,5aR)-5-(((benzyloxy)carbonyl)oxy)-2-methyl-1a-(prop-1-en-2-yl)tetrahydro-1H-3,4-dioxa-2,5-methanocyclobuta[cd]pentalen-1a1(3aH)-yl)methyl benzoate结构式](https://image.chemsrc.com/caspic/277/154854-77-0.png)