Indeed some TV reports about the deaths at the House of Blues (the concerts they have are usually anything BUT blues) and Electric Zoo in NY usually mention molly is also known as ecstacy.
Wiki.: “MDMA can induce euphoria, a sense of intimacy with others, diminished anxiety, and mild psychedelia.MDMA is criminalized in most countries...and its possession, manufacture, or sale may result in criminal prosecution... The term “mandy” or “molly” colloquially refers to MDMA in powder or crystalline form, usually implying a higher level of purity.”
It has been suggested that some of the “molly” taken may be made haphazardly. The deaths were due to overdoses. Maybe someone took the drug and didn’t “feel” anything right away...so, take a little more... and...