Table 1.

Chemical structures of 221 analogs.

	Compound	R1	R2			R3
Synthetic compounds group 1	S1a		-H			-H
	S1b		-H			-CH3
	S1c		-CH3			-H
	S1d		-F			-H
Synthetic compounds group 2	Compound	R1	R2			R3
	221	-CH3				-H
	S2a	-CH2CH2OH				-H
	S2b	-H				-H
	S2c	-CH3				-H
	S2d	-CH3				-CH3
	S2e					-H
	S2f	-CH3				-H
Commercially available analogs group 1	Compound	R1	R2	R3	R4	R5
	390		-H	-H	-H	-CH3
	391		-H	-OCH3	-OH
	394	-CH2CH3	-H	-H	-H
	395		-CH3	-H	-H
	396	-CH2CH3	-H	-F	-H
	397		-H	-CH3	-H	-CH3
Commercially available analogs group 2	Compound	R1	R2	R3		R4
	221	-CH3	=O			-OH
	312	-H	=O			-OH
	385	-CH3	=O			-OH
	387	-H	=O			-OH
Uncategorized commercially available analogs	Compound	Chemical illucture
	310
	384
	389
	392