Substantive derivative

A substantive derivative is like a copy of something, but with a few changes to make it different. It's like when you use your colored pencils to draw a picture of a cat, and then you draw another picture of a cat with a different color and a different pattern on its fur. Both are cat pictures, but they're not exactly the same.

In science, when people study chemicals or compounds, they can make a substance that is similar to the one they're studying, but with slight changes. This new substance is called a substantive derivative. It's made by changing some parts of the original substance with other parts that are similar but not exactly the same.

Scientists do this so they can test how the changes affect the substance. They can see if the changes make it work better or worse. It's like if you were testing how different colored pencils make your drawings look different.

In summary, a substantive derivative is a copy of something with a few changes made to it, created to help scientists study a substance and test how different changes affect it.