HISTOGEN INC. DL-0001 Watch

from S-4/A 4 pages City National Bank an Rbc Company 350 S. Grand Ave. Los Angeles, Ca 90071 Swift Address: Cinaus6l March 13, 2020 Irrevocable Standby Letter of Credit Number: Beneficiary: San Diego Sycamore, LLC C/O Longfellow Real Estate Partners 260 Franklin Street, Suite 1920 Boston, Ma 02110 Attn: Asset Management Applicant: Histogen, Inc 10655 Sorrento Valley Road San Diego, Ca 92121 Attn: Richard Pascoe Chairman & CEO Amount: Usd250,000.00 (U.S.DOLLARS Two Hundred Fifty Thousand and 00/100 Only) Expiry Date and Place: March 13, 2021 at City National Bank International Department, 350 S. Grand Avenue, Mail Code 944-01, Los Angeles, California 90071 Ladies/Gentlemen

from S-1/A 55 pages Loan and Security Agreement