Fig. 2From: Convergent synthesis of 13N-labelled Peptidic structures using aqueous [13N]NH3 HPLC chromatogram of the crude radiolabelled product (Table 1, entry 9). a Radioactivity (counts per second); target compound 1 at Rt 11.58 min; unreacted [13N]NH3 at Rt 1.82 min; unknown by-product at Rt 8.55 min. b UV absorption (254 nm) of reaction 1Back to article page