8-oxabicyclo[5.1.0]octa-3,5-diene

(1α,3α,5α,8α)-4,9-Dioxatricyclo[6.1.0.03,5]non-6-en

DL-(1α,2β,4β,8α)-3,9-Dioxatricyclo[6.1.0.02,4]non-5-en

2-hydroxy-3-nitrocyclohepta-2,4,6-trien-1-one

(7-氧代-1-环庚并-1,3,5-三烯基)乙酸酯