Ngày tải lên :
25/03/2014, 12:21
... R1=R2=R3=COCH3 6, 88 s 7, 16 d 7 ,63 dd 7, 72 d 6, 88 s 7, 16 d 7 ,63 dd 7, 73 d 7, 02 s 7, 30 d 7, 72 dd 7, 80 d 6, 97 s 7, 36 d 7 ,66 dd 7, 78 d R =R =(CH3)NCO; R =OH 6 ,53 s 7, 23 d 7 ,66 dd 7, 75 d R1=R2=R3=CH3 6, 75 s 6, 99 ... 6, 99 d 7, 71 dd 7, 70 d 10 R =R =R =CH2C6H5 6, 73 s 7, 00 d 7 ,63 dd 7, 74 d 11 R1=R3= 6, 48 s 6, 98 d 7, 71 dd 7 ,68 d 6, 49 s 6, 99 d 7 ,68 dd 7 ,69 d R =R =R =CO(CH2)4CH3 R =R =R =COC6H5 R1=R2=R3=C6H5OCO ... chất OMe MeO 1' O R3O 10 2' 3' 4' OR1 6' 5' H-8 H -5' H -6 H-2 OMe 6 , 56 s 7, 01 d 7 ,66 dd 7 ,69 d 6, 89 s 7, 17 d 7 ,64 dd 7, 73 d R =R =R =CO(CH2)2CH3 6, 88 s 7, 16 d 7 ,63 dd 7, 73 d R1=R2=R3=CO(CH2)3CH3...