Ergothioneine497-30-3100 % similar D-Histidine351-50-835 % similar Dl-histidine4998-57-635 % similar Histidine71-00-135 % similar D-Histidine hydrochloride6341-24-833 % similar DL-Histidine hydrochloride6459-59-233 % similar Dl-histidine monohydrochloride monohydrate123333-71-132 % similar L-Histidine hydrochloride monohydrate5934-29-232 % similar N-Acetyl-L-histidine2497-02-131 % similar 1-Methyl-L-histidine332-80-930 % similar 3-Methylhistidine368-16-130 % similar