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 ።
L-Ergothioneine (EGT, ERGO, CAS: 497-30-3), tun mọ bi (S) -α-Carboxy-2,3-dihydro-N, N, N-trimethyl-2-thioxo-1H-imidazole- Iyọ ti inu 4-ethanaminium, ni a gbe jade ni akọkọ lati aiṣedede nipasẹ Tanret C ni ọdun 1909, lẹhinna o tun ṣe awari ninu ẹjẹ ẹranko.