Update index.mdx

docs/repo/details_standards/index.mdx

@@ -33,7 +33,7 @@ Case 3: A typical repetition of a reaction is given, if the second reaction foll
 Case 4: Another typical repetition of a reaction is given, if the second reaction follows the same procedure with changed amounts of the components to perform the reaction on another scale. 
 **New own reaction**: A new reaction is everything that is not a reaction version or a reaction repetition and refers to the reactions of one single user or his collaborations. <br />
 
-### Characterization of compounds</br>
+### Characterization of compounds<br />
 
 **New compounds:** New compounds (not literature known compounds) must be provided
 with analytical data that adequately approve the identity and degree of purity (homogeneity)