compound ergothioneine compound UPa:UPC05570 CHEBI:4828 C9H16N3O2S InChI=1S/C9H15N3O2S/c1-12(2,3)7(8(13)14)4-6-5-10-9(15)11-6/h5,7H,4H2,1-3H3,(H2-,10,11,13,14,15)/p+1/t7-/m0/s1 KEGG:C05570 CHEBI:82707