"urpose of delivery, distribution, or dispensation by means of the Internet in violation of section 309(e); (C)serving as an agent, intermediary, or other entity that causes the Internet to be used to bring together a buyer and seller to engage in the dispensing of a controlled substance in a manner not authorized by sections 303(f) or 309(e); (D)offering to fill a prescription for a controlled sub" . . . . .