An analogue, not another tadalafil format
PubChem records aminotadalafil as C₂₁H₁₈N₄O₄, while tadalafil is C₂₂H₁₉N₃O₄. This is a change in molecular identity, not merely a capsule, liquid or salt designation. Similar names cannot establish equal pharmacology or substitute for compound-specific evidence.
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