Euphorbia tirucalli β-amyrin cyclase: Trp612 and Tyr736 π-electrons participate in a cation-π interaction with the transient cation and a CH-π interaction with Leu734, respectively.

Euphorbia tirucalli β-amyrin cyclase: Trp612 and Tyr736 π-electrons participate in a cation-π interaction with the transient cation and a CH-π interaction with Leu734, respectively.