L-Ergothioneine (EGT, ERGO, CAS: 497-30-3), (S) -α-Carboxy-2,3-dihydro-N, N, N-trimethyl-2-thioxo-1H-imidazole- 4-ኤታኒሚየም ውስጣዊ ጨው ፣ በመጀመሪያ በታይተን ሲ በተደረገው በደል የተወሰደው በ 1909 ነበር ፣ ከዚያ በኋላ በእንስሳት ደም ውስጥም ተገኝቷል ።
I-L-Ergothioneine (i-EGT, i-ERGO, i-CAS: 497-30-3), ekwabizwa ngokuba yi (S) -cy-Carboxy-2,3-dihydro-N, N, N-trimethyl-2-thioxo-1H-imidazole- I-4-ethanaminium yangaphakathi yetyiwa, yaqala ukukhutshwa kwi-ergot nguTanret C ngo-1909, emva koko kwafunyanwa negazi lesilwanyana.