2-Methylserine

2-Methylserine is a non-proteinogenic amino acid that is structurally similar to serine. Like serine, it is polar, and therefore soluble in water. It differs structurally from serine by the presence of a methyl group on the backbone carbon.
2-Methylserine is one of the amino acids produced by an unpublished volcanic-spark discharge experiment conducted by Stanley Miller in the early 1950s. However, the presence of this and many other organic compounds was not discovered until Jeffrey Bada et al. re-analyzed the contents of the vials from Miller's experiment in 2008.