Main Reaction: trp + dimethylallyl diphosphate >> 4-(γ,γ-dimethylallyl)tryptophan

Reference: PubMed ID: 28168931
Authors: Florea S, Panaccione DG, Schardl CL
Title: Ergot Alkaloids of the Family Clavicipitaceae.
Published: 2017 May

trp + dimethylallyl diphosphate --> 4-(γ,γ-dimethylallyl)tryptophan