13D Filing: James E. Flynn and DFB Healthcare Acquisitions Corp.

The foregoing summaries of certain terms of the Letter Agreement,
Registration Rights Agreement, Warrant Agreement, Warrant Purchase Agreement and the LLC Agreement are not complete and are qualified
in their entirety by reference to the full text of such documents, copies of which are filed, or incorporated by reference, as Exhibits
1-5 to this Schedule 13D.

Exhibit 2

Registration Rights Agreement, dated as of February 15, 2018, between the DFB Healthcare Acquisitions
Corp., Deerfield/RAB Ventures, LLC and the Initial Stockholders (incorporated by reference to Exhibit 10.3 to the Company’s
Current Report on Form 8-K filed with the SEC on February 22, 2018). 

Exhibit 3

Warrant Agreement, dated February 15, 2018, between DFB Healthcare Acquisitions Corp. and Continental
Stock Transfer & Trust Company (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K
filed with the SEC on February 22, 2018). 

Exhibit 4

Warrant Agreement, dated February 15, 2018, between DFB Healthcare Acquisitions Corp. and Deerfield/RAB
Ventures, LLC (incorporated by reference to Exhibit 10.4 to the Company’s Current Report on Form 8-K filed with the SEC on
February 22, 2018). 

Exhibit 5

Limited Liability Company Agreement of Deerfield/RAB Ventures, LLC, dated as of February 15, 2018, by
and between RAB Ventures (DFB) LLC and Deerfield Private Design Fund IV, L.P. *