Wikipedia
P-Chlorocresol
p-Chlorocresol (p-chloro-m-cresol; PCMC; brand name: Preventol CMK) is a chlorinated phenol which is used as an antiseptic and preservative. It forms colourless, dimorphous crystals at room temperature and is only slightly soluble in water. For use as a disinfectant such as a hand wash, it is commonly dissolved in alcohol in combination with other phenols. It is a moderate allergen for sensitive skin.