2-azabicyclo[2.2.1]heptan-3-one, 2-(2-butynyl)-1,7,7-trimethyl- 2-but-2-yn-1-yl-1,7,7-trimethyl-2-azabicyclo[2.2.1]heptan-3-one InChI=1/C13H19NO/c1-5-6-9-14-11(15)10-7-8-13(14,4)12(10,2)3/h10H,7-9H2,1-4H