threonine, l-threonine, thr, c4h9no3 essential amino acid molecule. structural chemical formula and molecule model. sheet of paper

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