4-Nitrophenyl 2-O-alpha-D-mannopyranosyl-alpha-D- mannopyranoside 68462-57-7 Para-nitrophenyl 2-O-alpha-D-mannopyranosyl-alpha-D-mannopyranoside alpha-D-Mannopyranoside, 4-nitrophenyl 2-O-alpha-D-mannopyranosyl-