Eko ti won fun won pelu bi won se le lo ohun ija kekere, idojuko iberu, eko nipa ewu iranlowo akoko fun eni ti o ba farapa, ati awon eko to jemo aabo.. 
Ìyípo yìí jẹ́  ipóyì ìbáṣepọ̀ kẹ́míkà àgọ́ ara àkọ́kọ́ tí wọ́n máa kọ́kọ́ ṣàwárí (Hans Krebs àti Kurt Hensele, 1932), ní ọdún marún sẹ́yìn kí wọ́n tó ṣàwárí ìyípo TCA.. 