31364-42-8 4,7,13,16,21-Pentaoxa-1,10-diazabicyclo(8.8.5)tricosane 4,7,13,16,21-Pentaoxa-1,10-diazabicyclo[8.8.5]tricosane Cryptating agent 221 EINECS 250-592-1 NSC 321059