the uptake of l-carnitine was inhibited by ( 1 ) d-carnitine , gamma-butyrobetaine , and ( 2 ) acetyl-l-carnitine . gamma-butyrobetaine and acetyl-l-carnitine were competitive inhibitors of l-carnitine uptake .
C0007258
carnitine
C0001040
acetyl-l-carnitine