2,6,6-trimethyl-bicyclo[3.1.1]hept-2-ene 2,6,6-trimethylbicyclo[3.1.1]hept-2-ene 80-56-8 ALPHA-PINENE (DL) InChI=1/C10H16/c1-7-4-5-8-6-9(7)10(8,2)3/h4,8-9H,5-6H2,1-3H bicyclo[3.1.1]hept-2-ene, 2,6,6-trimethyl-