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ISOCYANATES, MONOMERIC 5521
www.cdc.govISOCYANATES: METHOD 5521, Issue 2, dated 15 August 1994 - Page 3 of 6 SAMPLE PREPARATION: 7. Add 25 µL acetic anhydride to acetylate the excess 1-(2-methoxyphenyl)piperazine remaining in