Description: 534 organic compounds -- part of the class 532-570 series / 534 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 1) (573) azo (751) hetero ring containing (753) azo bonded directly to the hetero ring or to a polycyclo ring system which contains the hetero ring as one of the cyclos (787) the hetero ring is one of the cyclos in a polycyclo ring system (788) the hetero ring consists of sulfur, nitrogen and carbon (e.g., benzothiazole, etc.)
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