The present invention provides a compound represented by general formula below or a pharmaceutically acceptable salt thereof:wherein: X is selected from heteroaryl etc. The method substantially overcomes the problems of aggregation, contamination and pyrophoricity inherent in nanoparticulates. An exemplary system and method relates to a web-based survey technique that facilitates developing and testing new products, business investments, and value propositions, as well as testing existing products, businesses, and value propositions.