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Figure 3
The supra­molecular carb­oxy­lic acid–amide heterosynthons observed in theobromine–carb­oxy­lic acid systems. Synthons A [observed in structures with CSD refcodes UKOLAK (Gołdyn et al., 2020BB18) and CSATBR (Shefter et al., 1971BB60)] and B [HIJYEF (Karki et al., 2007BB61), MUPPET (Clarke et al., 2010BB62) and ZOYBOG (Jacobs & Amombo Noa, 2015BB63)] represent synthons with the participation of the exo- and endo-carbonyl O atom, respectively.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 77| Part 11| November 2021| Pages 713-724
https://doi.org/10.1107/S2053229621010883
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