Oxalic acid
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Oxalic acid (HOOC-COOH) is found in most types of vinegars.
Amber acid (HOOC-CH2-CH2-COOH) is found in living organisms. It helps in material exchange of some of the important materials organisms need. With its help, a process known as biological oxidation (cell breathing) takes place. This is one of the most important biological processes, one in which the body synthesises its own energy.
