Phenylalanine and tyrosine methyl ester intramolecular interactions and conformational analysis by 'ANTIPOT.1 H' NMR and infrared spectroscopies and theoretical calculations - Cormanich, Rodrigo A; Ducati, Lucas Colucci; Tormena, Cláudio F; Rittner, Roberto (Spectrochimica Acta A, 2014)