缬氨酸 Traditional form: 纈氨酸 Pinyin (reading): xié'ānsuān Definitions: valine (Val), an essential amino acid Characters: 缬 - knot; to tie a knot 氨 - ammonia 酸 - tart, sour; spoiled; acid Traditional characters: 纈 - knot; to tie a knot 氨 - ammonia 酸 - tart, sour; spoiled; acid