1. The dibenzopyran number system is used. See table 1 for positions and numbers.
2. R. Mechoulam, Marijuana. Academic Press, New York 1973.
3. Anon., Chem. Eng. News, Sept. 30, 15 (1974).
4. P. Stark and R. A. Archer, Pharmacologist17, 210 (1975).
5. L. Lemberger and H. Rowe, Pharmacologist17, 210 (1975).