. 2011 May 26;6(5):e20374. doi: 10.1371/journal.pone.0020374

Table 1. Chemical properties and activities of new alanine racemase inhibitors and cycloserine^*.

Hits	Inhibitor	MW	IC₅₀µM	¹Mtb	²MIC µM	³TC₅₀µM	⁴T_i	KimM
L2-01	N′,N′,4-trimethylbenzenesulfonohydrazide	214	9.0	−	ND	ND	ND	ND
L2-02	2-N′,2-N′,7-N′,7-N′-tetramethyl-9H-fluorene-2,7-disulfonohydrazide	410	1.6	−	ND	ND	ND	ND
L2-03	N-hydroxy-2-(2-hydroxyphenoxy)acetamide	183	8.2	−	ND	ND	ND	ND
L2-04	ethyl 3-(pyridin-2-ylthio)propanoate	211	2.6	+	59	229.8	4	0.038
L2-05	N-benzyl-5-chloro-2-methylsulfonylpyrimidine-4-carboxamide	326	6.8	+	9	20	2	0.63
L2-06	5-chloro-N-(3-chloro-4-methoxyphenyl)2(methylsulfonyl)pyrimidine-4carboxamide	346	8.2	+	<4.5	18.8	4	0.76
L2-07	2-(4-methylphenyl)-1-morpholin-4-ylethanethione	235	6.5	−	ND	ND	ND	ND
L2-09	2-(4-methoxyphenyl)-1-morpholin-4-ylethanethione	251	3.3	−	ND	ND	ND	ND
L2-10	6-O-[3-chloro-4-(6-methoxycarbonylpyridine-2-carbonyl)oxyphenyl]2-O-methyl pyridine-2,6-dicarboxylate	471	1.0	+	13.6	157.2	12	0.68
L2-11	2-(pyridin-3-ylcarbamothioyl sulfanyl)acetic acid	228	13.1	−	ND	ND	ND	ND
L2-12	2-phenyl-1-piperidin-1-ylethanethione	219	6.0	+	28.6	406	14	0.08
L2-13	2-(4,6-dimethyl-3-oxo-[1], [2]thiazolo[5,4-b]pyridin-2-yl)-N-[2-(4-ethoxyphenyl)ethyl]acetamide	384	7.7	+	16.2	36.4	2	0.93
L2-14	2-(hydoxyimino)-6-methyl-2H-benzopyran-3-carboxamide	208	2.8	−	ND	ND	ND	ND
L2-15	2-(2-hydroxyphenoxy)-N-methylacetamide	181	5.7	−	ND	ND	ND	ND
L2-16	3,3-dihydroxy-1H-quinoline-2,4-dione	193	5.2	+	32.4	33.7	1	0.02
L2-18	1,1′-(2-oxido-1,2,5-oxadiazole-3,4-diyl)-bis (1-(2-thienyl))-methanone	288	4.9	−	ND	ND	ND	ND
CS	(4R)-4-amino-3-isoxazolidinone	102	58	+	65	203	3	0.086

antimicrobial activity against M. tuberculosis (+ active, − inactive);

MIC against M. tuberculosis;

Cytotoxicity in HeLa cells,

⁴

Ti = TC₅₀/MIC, ND- not determined; CS- cycloserine.

*Chemical structures of inhibitors are provided in Table S1.

Table 1. Chemical properties and activities of new alanine racemase inhibitors and cycloserine*.