pharmaceutical intermediates, water treatment chemicals, OLED materials Carbohydrazide CAS: 497-18-7 ; o-Phthalaldehyde (OPA) CAS: 643-79-8 ; 4-hydroxy tempo CAS: 2226-96-2; Cooling agent WS-23) CAS: 51115-67-4 ;
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China (Mainland)
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