Proposed chemical pathway to ethanolamine (figure taken from Rivilla et al. 2021b). The molecular species in red have been detected towards the G+0.693 molecular cloud. The grey-shaded area corresponds to a hydrogenation chain. The chemical reactions indicated with coloured arrows have been proposed in previous works: magenta (Wakelam et al. 2015), blue (Kameneva et al. 2017), orange (Suzuki et al. 2018), cyan (Krasnokutski 2021), and green (Suzuki et al. 2018; Ruaud et al. 2015). The formation routes proposed in Rivilla et al. (2021b) are shown in black. The solid arrows indicate surface chemistry reactions, dashed arrows denote gas phase chemistry.