Table 4.

Experimental and Theoretical (DFT)¹³C and ¹H chemical shifts of 24CPA.

Atom	Experimental ppm	DFT/B3LYP ppm
H19	7.44	7.67
H20	7.43	7.59
H18	6.61	6.77
H21	6.62	6.57
H17	-	6.53
H14	4.35	4.55
H16	3.89	3.88
H15	2.51	3.86
C1	172.83	180.76
C5	152.74	153.02
C9	-	141.08
C10	134.38	140.06
C13	121.58	123.80
C8	-	117.61
C7	113.15	113.03
C11	-	105.77
C6	44.72	44.09