Amino acids methyl ester L-alanine methyl ester hydrochloride L-leucine methyl ester hydrochloride L-aspatic acid dimethyl ester hydrochloride L-isoleucine methyl ester hydrochloride L-aspatic acid-¬--methyl ester hydrochloride L-phenylalanine methyl ester hydrochloride L-cysteine methyl ester hydrochloride L-proline methyl ester hydrochloride Glycine methyl ester hydrochloride L-serine methyl ester hydrochloride L-glutamic acid dimethyl ester hydrochloride L-tryptophan methyl ester hydrochloride L-tyrosine methyl ester hydrochloride L-tyrosine methyl ester L-valine methyl ester hydrochloride L-cystine dimethyl ester dihydrochloride 25 kg net per fiber drums