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Formulas which begin with C₂₁H₂₀N₄

All formulas are in Hill order.

• C₂₁H₂₀N₄O______ (2 species)
• C₂₁H₂₀N₄S₂ (9H-purine-6(1h)-thione, 9-benzyl-1-[2-(p-tolylthio)ethyl]-)