| http://www.w3.org/ns/prov#value | - Metal salts include for example alkali or earth alkali salts; acid addition salts include salts of a compound of formula I with an acid, e.g. hydrogen fumaric acid, fumaric acid, naphthalin-1,5-sulphonic acid, phosphoric acid, tartaric acid, citric acid, hydrochloric acid, deuterochloric acid; preferably hydrochloric acid.
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