| CPC C07D 219/06 (2013.01) [C07D 215/04 (2013.01); C07D 215/48 (2013.01); C07D 249/06 (2013.01); C07D 401/04 (2013.01); C07D 471/04 (2013.01)] | 12 Claims |

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1. A compound having the structure of formula (I):
![]() or a pharmaceutically acceptable salt thereof, wherein:
![]() is a naphthalene or a quinoline;
X is selected from a bond and an optionally substituted alkyl or alkene;
Y is selected from —OR′, —CONR′2, —COOR′ and optionally substituted heteroaryl;
R′ is H or an optionally substituted alkyl;
Z is independently selected from H, optionally substituted alkyl, and —X-Y, or two Z together form an optionally substituted cycloalkyl, wherein when Z1 and Z2 are both H, then Y is heteroaryl, or wherein Z1 and Z2 are not both H;
a is 0 or an integer of 1-4; and
wherein the compound of formula (I) is selected from:
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