Figure 1. Structure of narcotic phytocannabinoids Δ 8 -THC, Δ 9 -THC, CBN with high affinity for Figure 1. Structure of narcotic phytocannabinoids ∆ 8 -THC, ∆ 9 -THC, CBN with high affinity for ligands ligands CB1 and CB2 and of non-narcotic phytocannabinoids CBG and CBD. Numbering system and CB1 and CB2 and of non-narcotic phytocannabinoids CBG and CBD. Numbering system and binding Figure 1. Structure of narcotic phytocannabinoids Δ 8 -THC, Δ 9 -THC, CBN with high affinity for Figure 1. Structure of narcotic phytocannabinoids Δ 8 -THC, Δ 9 -THC, CBN with high affinity for binding affinities are reported. affinities are reported. ligands CB1 and CB2 and of non-narcotic phytocannabinoids CBG and CBD. Numbering system and ligands CB1 and CB2 and of non-narcotic phytocannabinoids CBG and CBD. Numbering system and binding affinities are reported. binding affinities are reported. Table 1. Phytocannabinoids classification based on the nature of the resorcinyl side-chain. 1 Table 1. Phytocannabinoids classification based on the nature of the resorcinyl side-chain. 1 Table 1. Phytocannabinoids classification based on the nature of the resorcinyl side-chain. 1 Table 1. Phytocannabinoids classification based on the nature of the resorcinyl side-chain.