CHNOPSCarbon, Hydrogen, Nitrogen, Oxygen, Phosphorous, Sulfur (mnemonic for the six most abundant elements in the human body)
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Grind up any known organism and you get CHNOPS, she says, but all those organisms are also thought to come from a single ancestor.
An estimation of the possible number of covalently bonded compounds of CHNOPS with a molecular weight less than 300 Da, conforming to the maximal size of the core components, yields a number at least in the millions and probably several orders of magnitude higher (Fink et al, 2005).