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. 2022 Jun 3;27(11):3604. doi: 10.3390/molecules27113604

Figure 1.

Figure 1

Stationary point geometries along the reaction of [Gly] with SO2. (Top): Path with a 5-mamber transition state that sees the transfer of a proton toward the carboxylate. (Bottom): Path involving a 4-member ring with proton transfer on the SO2. The last two structures in the top sequence are conformers, while those of the bottom sequence are isomers.