C 20 H 15 N 3 S, M r =329.43, monoclinic, P2 1 /c, a=11,745 (4), b=7.600 (4), c=21.929 (6) A, β=118.36 (4) o , V=1722.4 (1.0) A,, Z=4, D x =1.270 g cm -3 , λ(Mo Kα)=0.7107 A, μ=1.8 cm -1 , F(000)=688, T=297 K, R=0.038 for 1372 reflections. The mesoionic compound has a nearly planar pentatomic heterocyclic ring and an exocyclic C-S - bond
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Cheung et al. (1993) studied this question.
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