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BTDA CAS: 2421-28-5 3,3′,4,4′-benzophenonetetracarboxylic dianhydride
Anaran'ny vokatra 3,3′,4,4′-benzophenonetetracarboxylic dianhydride fanafohezana BTDA Cas No. 2421-28-5 Bika Aman 'endrika fahadiovana ≥98% Ion metaly Ny formula molecular