What is the absolute configuration of (+)-crispatanolide isolated from Makinoa crispata (liverwort)?

What is the absolute configuration of (+)-crispatanolide isolated from Makinoa crispata (liverwort)?

Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron Letters - Volume 56, Issue 34, 19 August 2015, Pages 4912-4915

Katsuyuki Nakashima, Hiroyuki Kawano, Minako Kumano, Hikari Kodama, Masayo Kameoka, Akiyo Yamamoto, Reiko Mizutani, Masakazu Sono, Motoo Tori,