The proof is in the product.
Marris
Emma
E
D000363:Agaricales / Q000737:chemistry; D002621:Chemistry / Q000592:standards; D004852:Epoxy Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D015394:Molecular Structure; D017712:Peer Review, Research; D011083:Polycyclic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D015203:Reproducibility of Results
D004852:Epoxy Compounds; D011083:Polycyclic Compounds; C469535:hexacyclinol