N,N'-bis(Fmoc)-L-cystine

(fmoc-cys)2

n-alpha,n-alpha-bis-fmoc-l-cystine

n,n'-di-9-fluorenylmethoxycarbonyl-l-cystine

(fmoc-cys-oh)2 (disulfide bond)

(2r,2'r)-3,3'-disulfanediylbis(2-((((9h-fluoren-9-yl)methoxy)carbonyl)amino)propanoic acid)

n,n'-bis-fmoc-l-cystine

nα,nα-bis-fmoc-l-cystine