Small molecule inhibitors of mammalian SLC6A19 function

A compound of Formula (I):

• wherein:
• n is 1;
• L1 is -alkyl-;
• L2 is absent;
• L3 is —C(O)—;
• X1 and X2 are independently selected from —H and cycloalkyl;
• provided that X1 and X2 are not both —H;
• Y1 is unsubstituted or substituted aryl;
• Y2 is selected from hydroxyalkyl and —NH(Y2′);
• Y2′ is alkyl;
• and
• Y3, Y4, Y5, and Y6 are independently selected from —H, and halide;
• or a pharmaceutically acceptable salt thereof.