What is this equality called and what are the conditions?

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$P(A,B|C)=P(B|C)P(A|B,C)$

Does this property have a unique name? How do we derive it and what are the properties? Does it come from Bayes only or do we need other properties?

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That is the definition of conditional probability. Everything in the equation is "given $C$." So if we ignore that, it simplifies to $$ P(A,B) = P(B)\cdot P(A|B)$$