.alpha.-Pinene 2,6,6-Trimethylbicyclo[3.1.1]-2-hept-2-ene 2,6,6-Trimethylbicyclo[3.1.1]-2-heptene 2,6,6-Trimethylbicyclo[3.1.1]hept-2-ene 2-Pinene 80-56-8 Bicyclo[3.1.1]hept-2-ene, 2,6,6-trimethyl- NSC7727 PINENE, ALPHA Pinene Pinene isomer