(1R,8S)-9-oxabicyclo[6.1.0]non-4-yne 9-oxabicyclo[6.1.0]non-4-yne, (1R,8S)- InChI=1/C8H10O/c1-2-4-6-8-7(9-8)5-3-1/h7-8H,3-6H2/t7-,8