Table 3.

¹³C NMR of (a) L1, (b) L2, (c) L3, (d) L4.

Compound	13C NMR (δ, ppm)
L1	18.07	(py-CH3)
	52.95	(py-OCH3)
	121.67	(py-C)
	125.75	(py-C)
	127.68	(py-C)
	127.70	(py-C)
	138.81	(py-C)
	139.74	(py-C)
	146.32	(py-C)
	146.60	(py-C)
	149.13	(py-C)
	149.79	(py-C)
	161.27	(C O)
	164.86	(C O)
L2	21.55	(py-CH3)
	53.03	(py-OCH3)
	114.97	(py-C)
	121.38	(py-C)
	125.64	(py-C)
	127.85	(py-C)
	138.82	(py-C)
	146.97	(py-C)
	147.07	(py-C)
	149.49	(py-C)
	150.62	(py-C)
	150.68	(py-C)
	161.91	(C O)
	164.95	(C O)
L3	17.93	(py-CH3)
	53.00	(py-OCH3)
	113.77	(py-C)
	125.59	(py-C)
	127.73	(py-C)
	129.59	(py-C)
	138.76	(py-C)
	138.93	(py-C)
	146.92	(py-C)
	148.13	(py-C)
	148.79	(py-C)
	149.70	(py-C)
	161.70	(C O)
	164.99	(C O)
L4	24.13	(py-CH3)
	53.01	(py-OCH3)
	111.13	(py-C)
	119.70	(py-C)
	125.64	(py-C)
	127.74	(py-C)
	138.59	(py-C)
	138.76	(py-C)
	146.91	(py-C)
	149.76	(py-C)
	150.25	(py-C)
	157.28	(py-C)
	161.83	(C O)
	164.96	(C O)