tokens: The catechol and hydroquinone metabolites , NCQ436 and NCQ344 , induced apoptosis in HL60 and HBMP cells in a time - and concentration dependent manner , while the phenols , NCR181 , FLA873 , and FLA797 , and the derivatives formed by oxidation of the pyrrolidine ring , FLA838 , NCM001 , and NCL118 , had no effect .