Table 1 The list of absorption peaks of L-2HG and D-2HG.

0.769

0.613

0.760

0.645

0.009

the torsion of the whole carbon chain

1.137

1.248

1.200

1.065

0.137

Vibration and aggressively torsion of carbon chain

1.456

1.680

1.695

1.835

0.239

torsion and vibration of the ring

1.933

2.066

2.217

2.354

0.284

concertina movement of the whole ring