threonine, l-threonine, thr, c4h9no3 essential amino acid molecule. structural chemical formula and molecule mode

acid amino atom atomic biosynthesis c4h9no3 carbon cheese chemical chemistry chiral cottage drawing essential fish flat formula hydrogen icon illustration immunostimulant lentils lthreonine meat mode model molecular molecule nitrogen organic oxygen poultry protein proteinogenic seeds sesame structural structure thr threonine vector