Boc-Asn(Xan)-OH (CAS NO.65420-40-8), its Synonyms are N-Boc-N'-xanthyl-L-asparagine ; N-Boc-L-asparagine(xanthyl) ; N-Boc-Nt-Xanthyl-l-asparagine ; Nalpha-Boc-Nbeta-Xanthenyl-l-asparagine ; N-alpha-boc-N-beta-Xanthyl-l-asparagine ; Nalpha-Boc-Ngamma-(9-xanthenyl)-l-asparagine ; Nalpha-Boc-Ngamma-Xanthyl-l-asparagine ; N-alpha-t-Boc-N-beta-xanthyl-l-asparagine ; N-alpha-t-Boc-N-gamma-xanthyl-l-asparagine . It is white to off-white powder.