Among the following L-serine is

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The laevorotatory isomer of 2-amino-3-hydroxypropanoic acid A rule of thumb for determining $D / L$ isomeric form of an amino acid is the corn rule. The groups: $COOH, R, NH_{2}$ and $H$ (where $R$ is an unnamed carbon chain) are arranged around the chiral center carbon atom. Sighting from the hydrogen atom, if these groups are arranged counterclockwise around the carbon atom, then it is the D-form. If clockwise, it is the L-form. According to priority order : $- NH_{2}, - COOH, - CH_{2} OH, - H$ .

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