Identified lines of CH 3 NCO, ν=0 towards SMM1. The observed spectrum is plotted in black, with the best-fit synthetic spectrum overplotted in blue (N T = (6.4±1.9)×10 14 cm −2 , T ex = 240±60 K). The transition is indicated at the top of each panel and the upper state energy is given in the top left of each panel.

Identified lines of CH 3 NCO, ν=0 towards SMM1. The observed spectrum is plotted in black, with the best-fit synthetic spectrum overplotted in blue (N T = (6.4±1.9)×10 14 cm −2 , T ex = 240±60 K). The transition is indicated at the top of each panel and the upper state energy is given in the top left of each panel.

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Methyl isocyanate (CH$_{3}$NCO) and glycolonitrile (HOCH$_{2}$CN) are isomers and prebiotic molecules that are involved in the formation of peptide structures and the nucleobase adenine, respectively. ALMA observations of the intermediate-mass Class 0 protostar Serpens SMM1-a and ALMA-PILS data of the low-mass Class 0 protostar IRAS~16293B are used...