pnitrophenylbetaDgalactopyranoside

It looks like the term is truncated: "pnitrophenylbe..." Could you confirm the full name? It could refer to several different compounds or to the p-nitrophenyl functional group in general. For example, it might be p-nitrophenyl phosphate (a common chromogenic substrate for alkaline phosphatase), p-nitrophenyl acetate (an ester used in various reactions), p-nitrophenyl beta-D-glucopyranoside (a substrate for beta-glucosidase), or p-nitrophenyl benzoate (an organic ester). Please provide the exact compound or specify if you want an article about the p-nitrophenyl moiety in general. Once you confirm, I will write a concise, neutral wiki-style article under 300 words.