hexadeca-4t,12t-diene-1,7,9,15-tetrayne

4b,9b-dihydroindeno[2,1-a]indene-5,10-dione

cyclohexadeca-6t,14t-diene-1,3,9,11-tetrayne

2,3-二苯基琥珀酸

1,1'-bi(benzocyclobutenylidene)