Extended Data Fig. 7: O-succinimidyl pentyn-1-oxycarbonyl and beta-carboxymethyl-oxyethyl-O-peracetyl-D-glucoside active ester.
From: Glucose-sensitive insulin with attenuation of hypoglycaemia

a, O-succinimidyl pentyn-1-oxycarbonyl. b, beta-carboxymethyl-oxyethyl-O-peracetyl-D-glucoside active ester. Carbon atoms are numbered to allow identification of the NMR assignments provided in the Supplementary Data.