12 at Wesleyan University hospitalized after taking Molly

The president of the of the university, located in Middletown, Connecticut, said that eight students remained hospitalized. Four were expected to be released from the hospital Monday, he wrote in a letter to the community.

President Michael S. Roth described Molly as a refined form of MDMA with “extremely dangerous” effects. MDMA is the active ingredient in the drug Ecstasy.

CNN’s Drew Griffin. Nelli Black and Patricia DiCarlo contributed to this report.