definiens: ), subject to Section 6.3.6 . For purposes hereof, " Related Producf ' is defined as a small molecule that selectively binds to the active site of ( a ) a - galactosidase A for the treatment or prevention of Fabry Disease, ( b ) b­glucocerebrosidase for the treatment or prevention of Gaucher Disease, ( c ) a - glucosidase for the treatment or prevention of Pompe Disease or ( d ) to the extent the Parties agree pursuant to Section 6.1.5 to expand the Field for a Compound and agree to add an additional target for such Compound, such other target for such indication, and in each such case whose primary therapeutic activity results from such selective binding, provided, that the restrictions of this Section 6.3 shall not apply to { WG}<[***l > for { Parkinson}<[***l > 's or a Licensed Product being Commercialized pursuant [ * * * ) INDICATES MATERIAL THAT HAS BEEN OMITTED AND FOR WHICH CONFIDENTIAL TREATMENT HAS BEEN REQUESTED . ALL SUCH OMITTED MATERIAL HAS BEEN FILED WITH THE SECURITIES AND EXCHANGE COMMISSION PURSUANT TO RULE 24b-2 PROMULGATED UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED