Figure 4.

Variations around diterpenoids found in six species of Euphorbia. Compounds were drawn from the works on Euphorbia. Z : ent-abietane-type diterpenoid (Z1) and a tiglane (Z2) (Wang et al., 2017); AA: gaditanone (Flores-Giubi et al., 2017); AB: ingenane-type diterpenoid, euphorkan A (Zhang et al., 2018); AC: jatrophane-type ester (Nothias et al., 2017); AD: dideoxyphorbol ester (Esposito et al., 2017); AE: diterpenoid alkaloid sooneuphoramine (Gao and Aisa, 2017); AF: jatrophane-type diterpenoid (Rédei et al., 2018); AG: abietane-lactone- and nor-rosane-based heterodimeric terpenoids (Wei et al., 2017). Note that the stereospecificity of the compounds was not given, as many different compounds were described in each of those references.