text: 4-PPBP and ditolylguanidine bind to a receptor previously thought to serve as a receptor for these compounds.
full_question: 4-PPBP and ditolylguanidine bind to a receptor previously thought to serve as a receptor for these compounds. Eluxadoline and loperamide bind to receptors for these compounds, as does the branded drug Movantik, which serves to treat constipation induced by their ingestion. These compounds are the most common identified by a mixture of sulfuric acid and molybdic acid called the Froehde reagent. Prolonged exposure to this class of compounds can result in hyperalgesia. Enkephalin and nociceptin are endogenous examples of these compounds. Naloxone and naltrexone block the effects of these compounds. These compounds bind to a class of G protein-coupled receptors with mu, kappa, and delta varieties. The binding of these compounds to their mu receptors is believed to prevent nociceptive neurons from releasing substance P, causing analgesic effects. For 10 points, name these compounds named for their morphine-like effects
first_sentence: 4-PPBP and ditolylguanidine bind to a receptor previously thought to serve as a receptor for these compounds.