Are there alternatives to D-Glutamic acid (CAS: 138-16-9) in synthesis?

While D-Glutamic acid is a common amino acid, alternatives such as L-glutamic acid or synthetic equivalents can be used in specific applications. For instance, in the food industry, monosodium glutamate (MSG) is a well-known alternative. In synthetic routes, other amino acids or their salts can serve as substitutes depending on the reaction conditions and desired product.