Polyacetylenes occur widely in the plant family Campanulaceae. From Campanula glomerata L. 9-(tetrahydropyran-2-yl)-nona-trans,trans-2,8-diene-4,6-diyn-1-ol and 9-(tetrahydropyran-2-yl)-non-trans-8-ene-4,6-diyn-1-ol have been isolated and their structures confirmed by synthesis.