sentences:  Nonoxynol was found to metabolize into free nonylphenol when administered to lab animals.Arkopal-N60, with on average 6 ethylene glycol units is a related used surfactant.Nonoxynols are produced by ethoxylation of alkylphenols and vary in the number of repeating ethoxy (oxy-1,2-ethanediyl) groups resulting in Nonoxynol-4, Nonoxynol-7, Nonoxynol-9, Nonoxynol-14, Nonoxynol-15, Nonoxynol-18, Nonoxynol-40, Nonoxynol-30 and Nonoxynol-50.