Fig. 2
From: A stable isotope dilution method for a highly accurate analysis of karrikins
Preparation scheme and isotope distribution of a newly synthesized internal standard. a Stable isotope labelled standard ([2H3]KAR1) was prepared from KAR bromoderivative (KAR-Br) under the following conditions (Cond.): [2H3]CB(OH)2, Pd(OAc)2, S-Phos, K3PO4, toluene. b Full-scan (m/z 150–160) positive-ion mass spectrum of [2H3]KAR1 (right), theoretical isotope model of [2H3]KAR1 (Molecular Formula: C8H3D3O3, left). R.A. – relative abundance (%)