(5Z)-5-[4-(2-ethynylphenyl)-4-hydroxybut-2-yn-1-ylidene]cyclopent-1-en-1-yl trifluoromethanesulfonate InChI=1/C18H13F3O4S/c1-2-13-7-3-4-10-15(13)16(22)11-5-8-14-9-6-12-17(14)25-26(23,24)18(19,20)21/h1,3-4,7-8,10,12,16,22H,6,9H2/b14-8 methanesulfonic acid, trifluoro-, (5Z)-5-[4-(2-ethynylphenyl)-4-hydroxy-2-butynylidene]-1-cyclopenten-1-yl ester