= Solution
\b[Two <molecules> of the <aminopyridine> form a self-complementary <dimer> through two N–H···N contacts.] In each direction, one exocyclic amino <hydrogen> is the donor and the <pyridine> ring <nitrogen> of the other <molecule> is the acceptor.
Orient the two amino/pyridine-N edges toward one another, as in the second panel of the original homodimer drawing. Each <molecule> donates one NH and accepts at one ring N; the second amino H remains available for additional packing contacts. The <chlorine> substituent is retained but is not one of the two principal donor–acceptor sites.
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