Canniprene (C21H26O4) is an isoprenylated bibenzyl found in the fan leaves of Cannabis sativa. Canniprene can be vaporized and therefore potentially inhaled from cannabis. Canniprene (C21H26O4) is an isoprenylated bibenzyl found in the fan leaves of Cannabis sativa. Canniprene can be vaporized and therefore potentially inhaled from cannabis.