the conformation for each of two cannabinoids , delta 9-tetrahydrocannabinol ( thc ) , the principal active constituent of marihuana , and delta 9,11-thc , a biologically inactive structural isomer of delta 9- thc , is analyzed by interpreting 1h-1h and 13c-1h coupling constants and nuclear overhauser effects determined using one-and two-dimensional 1h and 13c nmr techniques .
C0006864
cannabinoids
C0039663
delta 9