Negotiated Procedure With Exploratory Notice And Expression Of Interest On The Siaps/So.Re.Sa. Platform, Pursuant To Art. 76 Paragraph 2 For The Annual Supply Of Dmso (Dimethyl Sulphoxide), Required By Those Who Are Entitled To The Asl Naples 1 Centre, With Awarding Pursuant To Art. 108 Paragraph 3 Of Legislative Decree 36/2023