Number of carbon atom

Building blocks

1

Carbon monoxide & hydrogen (syngas)

2

acetic acid, acetic anhydride

3

Glycerol, 3 hydroxypropionic acid, lactic acid, malonic acid, propionic acid, serine

4

Acetoin, aspartic acid, fumaric acid, 3-hydroxybutyrolactone, malic acid, succinic acid, threonine

5

Arabinitol, furfural, glutamic acid, itaconic acid, levulinic acid, proline, xylitol, xylonic acid

6

Aconitic acid, citric acid, 2,5 furan dicarboxylic acid, glucaric acid, lysine, levoglucosan, sorbitol