Relative energies (including zero-point energy, ZPE, corrections) plotted as a function of the total dipole moment for the targeted C₃H₆O₂ isomers, computed at the B2PLYPD3∕aug-cc-pVTZ level of theory (Grimme et al. 2011) using the Gaussian 16 program package (Frisch et al. 2016). Optimized 3D structures at the same level of theory are also shown (carbon atoms in gray, oxygen atoms in red, and hydrogen atoms in white). The status of detections in G+0.693 is indicated using the following color-code in the molecule name: new first detections in the ISM are shown in red, tentative detections in orange, non-detections in purple, and previous detections toward different sources in black. Previous detections toward other sources of methyl acetate (Tercero et al. 2013), anti and gauche ethyl formate (Belloche et al. 2009; Tercero et al. 2013; Rivilla et al. 2017; Peng et al. 2019), hydroxyacetone (Zhou et al. 2020), and 3-hydroxypropanal are also included. Also, new detections based in this work are highlighted in boldface. The 3D representations of all molecules are visualized with IQmol (https://www.iqmol.org/).