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Cardiotonic steroids are a class of naturally occurring steroids that affect heart function. These compounds, often found in plants like foxglove, are glycosides, meaning they contain sugar residues attached to a steroid core called an aglycone.12

Medicinally, cardiotonic steroids such as digitoxin, gitoxin, and digoxin are used to strengthen the heart's contractility and slow its rate, making them crucial in treating heart failure. While the aglycone itself has some activity, the glycosides are generally more potent. Small modifications to steroid structures can significantly alter their biological effects.231

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