Oxazolidinone thioamides with piperazine amide substituents

A compound of formula I

• or a pharmaceutically acceptable salt thereof wherein:
• W is NHC(═S)R1,
• R1 is
• (a) H,
• (b) NH2,
• (c) NHC1-4 alkyl,
• (d) C2-4 alkenyl,
• (e) OC1-4 alkyl,
• (f) SC1-4 alkyl,
• (g) (CH2)n-C3-6 cycloalkyl, or
• (h) C1-4 alkyl, optionally substituted with 1-3 F, 1-2 Cl or CN;
• R2 and R3 are independently H, F, Cl or C1-2 alkyl;
• R4 is
• (a) —C(═O)—CH2S(O)n—CH3,
• (b) —C(═S)C1-4 alkyl,
• (c) —C(═O)—(CH2)m—C(═O)—CH3,
• (d) —C(═O)—CH2—O—R10, or
• (e) —CN;
• R10 is —CO2—(CH2)2—OCH3, or —C(═O)—NHC1-4alkyl;
• n is 0, 1 or 2;
• and m is 0 or 1.