... Anal. calcd. for CI7Hl6N4: C73.91, H 5.80, N 20.29; found: C 73.88, H 5.67, N 20.02. Acknowledgments We wish to thank the Natural Sciences and Engineering Research Council of Canada for financial support of this work. ... J. Org. Chern. ... Journal of Polymer Research 12, 53- ...