Abundance ratios [XD]/[XH] measured for organic species in sources at different evolutionary stages: prestellar cores (D₂CO (Bacmann et al. 2003; Chacón-Tanarro et al. 2019), CH₂DOH (Bizzocchi et al. 2014; Chacón-Tanarro et al. 2019; Ambrose et al. 2021), and HDCS (Marcelino et al. 2005; Vastel et al. 2018)); Class 0 protostars (D₂CO (Parise et al. 2006; Watanabe et al. 2012; Persson et al. 2018; Manigand et al. 2020), CH₂DOH (Parise et al. 2006; Bianchi et al. 2017b; Jørgensen et al. 2018; Jacobsen et al. 2019; van Gelder et al. 2020; Manigand et al. 2020), and HDCS (Drozdovskaya et al. 2018); Class I protostars (SVS13-A; D₂CO, CH₂DOH (Bianchi et al. 2017a), and HDCS (Bianchi et al. 2019a)); comets (Hale-Bopp; CH₂DOH (Crovisier et al. 2004) and 67P/C-G; CH₂DOH (Drozdovskaya et al. 2021)). The [XD]/[XH] values inferred for L1489-IRS, B5-IRS1, L1455-IRS1, and L1551-IRS5 are in magenta (from this work). The dashed bars represent values inferred for the hot corinos (r ≤ 100 au, T ≥ 100 K), while the filled bars indicate the measurements derived for extended envelope.