They are not particularly chemically related to each other, no. They were/are grouped together because there’s a lot of overlap in where they are found, and what they help the body do. Generally speaking, if you find one in nature in something that’s edible, you’re likely going to find the rest of them (or at least a few of the others). And they all help with metabolic processes that the body does. So they are found together and do similar things, but in terms of their actual chemical composition, they’re not related, no.
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