143294-31-9 L-Serine, glycyl-L-cysteinyl-L-cysteinyl-L-cysteinyl-L-asparaginyl-L-prolyl-L-alanyl-L-cysteinylglycyl-L-prolyl-L-asparaginyl-L-tyrosylglycyl-L-cysteinylglycyl-L-threonyl-L-seryl-L-cysteinyl- alpha-Conotoxin sii