... (±)-D3-trishomocubane was first synthesized in 1970 [3], the pure R-(+)- and S-(–)- forms were ... Axial D3-trishomocubane Derivatives with Potential Current Organic Chemistry, 2012, Vol. 16, No. 22 2627 PLLA - poly(L-lactide); PDLA - poly(D-lactide) ... A B Y A B X H H Scheme 7. ...