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Antel, J., Sheldrick, G.M., Bachmann, J. et al. Crystal and molecular structure of an Indoloquinolizine Derivative, C23H28N4O3·CH2Cl2 . Journal of Crystallographic and Spectroscopic Research 18, 619–624 (1988). https://doi.org/10.1007/BF01161155
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DOI: https://doi.org/10.1007/BF01161155