Question 21.1: Draw the Fischer projection for each amino acid: (a) L -leuc...

General, organic, & biological chemistry

Draw the Fischer projection for each amino acid: (a) L -leucine; (b) D -cysteine.

Analysis

To draw an amino acid in a Fischer projection, place the $-\mathrm{COO}^{-}$ group at the top and the R group at the bottom. The L isomer has the $-\mathrm{NH}_3{ }^{+}$ on the left side and the D isomer has the $-\mathrm{NH}_3{ }^{+}$ on the right side.

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