4-Ethynylbenzocyclobutene

3-Ethynyl-bicyclo[4.2.0]octa-1(6),2,4-triene

1-(cyclobut-1-en-1-ylMethyl)-4-ethynylbenzene

Bicyclo[4.2.0]octa-1,3,5-triene, 3-ethynyl- (9CI)