dasda 4-4 dinitro stilbene 2-2 disulphonic acid dnsda 4-4 diamino stilbene 2-2 disulphonic acid nasda pntosa para nitro toluene ortho sulphonic acid 4-amino 4-nitro stilbene 2-2 disulphonic acid dye intermediates diamino. optical brighteners intermediates dnsda mfg nast diamino pntsa dinitro 4 nitro toluene 2 sulphonic acid intermediates dye dnsd acid ansd dsd acid
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