3(R)-(cyclopentylmethyl)-2(R)-((3,4,4-trimethyl-2,5-dioxo-1-imidazolidinyl)methyl)-4-oxo-4-piperidinobutyrohydroxamic acid
3(r)-(cyclopentylmethyl)-2(r)-((3,4,4-trimethyl-2,5-dioxo-1-imidazolidinyl)methyl)-4-oxo-4-piperidinobutyrohydroxamic acid