If anhydrous compound A is already in IECSC, but the hydrate of A is not in IECSC. is it still necessary to register a new chemical substance for the hydrate of A? If one of A's hydrates is already in the IECSC, but A's other hydrates may not be in the IECSC. is it necessary to register a new chemical substance for A and its hydrates?
Answer: In the above two cases, A and its hydrate (any number of crystal water) do not need to be registered
