... (DMSO-d6) (+)-syringaresinol (pyridin-d5) H ppm (J, Hz) 500 MHz C ppm 125 MHz HMBC H ppm (J, Hz) 500 MHz C ppm 125 MHz >C= 131,4 132,2 ... t ht nhân proton (1) DEPT Distortionless Enhancement by Polarization Transfer Ph DEPT HMBC Heteronuclear Multiple Bond Coherence Ph ht nhân qua nhiu liên kt HSQC ... DEPT EL1 (DMSO) 9-hydroxycanthin-6-one (DMSO) H ppm (J, Hz) 500 MHz C ppm 125 MHz HMBC H ppm (J, Hz) 500 MHz C ppm 125 MHz 1 -CH< 8,12 (d, 5,0 Hz) 115,9 C-15 8,12...