(2~{S},3~{S})-3-methyl-2-[(1~{R})-2-[[(2~{S})-3-methyl-1-[[(2~{S})-3-methyl-1-oxidanylidene-1-phenylmethoxy-butan-2-yl] amino]-1-oxidanylidene-butan-2-yl]amino]-1-oxidanyl-2-oxidanylidene-ethyl]pentanoic acid

P23724 — Proteasome subunit beta type-6