Table S2. Selected  bond lengths [Å], angles [deg] and torsion angles for compound 2 

 P(1)-O(1)           1.506(1)      P(2)-C(1)          1.841(2)
 P(1)-O(2)           1.499(1)      N(1)-C(1)          1.514(2)
 P(1)-O(3)           1.566(1)      N(1)-C(5)          1.523(2)
 P(1)-C(1)           1.847(2)      N(1)-C(2)          1.531(2)
 P(2)-O(4)           1.491(1)      C(2)-C(3)          1.523(3)
 P(2)-O(5)           1.511(1)      C(3)-C(4)          1.532(3)
 P(2)-O(6)           1.577(1)      C(4)-C(5)          1.514(3)

 O(2)-P(1)-O(1)      116.3(1)      C(1)-N(1)-C(5)     115.5(1)
 O(2)-P(1)-O(3)      112.2(1)      C(1)-N(1)-C(2)     116.8(1)
 O(1)-P(1)-O(3)      107.4(1)      C(5)-N(1)-C(2)     105.9(1)
 O(2)-P(1)-C(1)      109.3(1)      N(1)-C(1)-P(2)     110.4(1)
 O(1)-P(1)-C(1)      104.2(1)      N(1)-C(1)-P(1)     115.5(1)
 O(3)-P(1)-C(1)      106.9(1)      P(2)-C(1)-P(1)     112.9(1)
 O(4)-P(2)-O(5)      117.1(1)      C(3)-C(2)-N(1)     105.4(1)
 O(4)-P(2)-O(6)      111.7(1)      C(2)-C(3)-C(4)     106.1(2)
 O(5)-P(2)-O(6)      107.2(1)      C(5)-C(4)-C(3)     103.7(2)
 O(4)-P(2)-C(1)      107.2(1)      C(4)-C(5)-N(1)     102.1(1)
 O(5)-P(2)-C(1)      108.4(1)
 O(6)-P(2)-C(1)      104.5(1)

 C(5)-N(1)-C(1)-P(1)           -73.2(2)
 C(2)-N(1)-C(1)-P(1)            52.3(2)
 C(5)-N(1)-C(1)-P(2)           157.2(1)
 C(2)-N(1)-C(1)-P(2)           -77.3(2)
 O(1)-P(1)-C(1)-N(1)           158.0(1)
 O(2)-P(1)-C(1)-N(1)            33.1(1)
 O(3)-P(1)-C(1)-N(1)           -88.5(1)
 O(4)-P(2)-C(1)-N(1)           175.6(1)
 O(5)-P(2)-C(1)-N(1)            48.3(1)
 O(6)-P(2)-C(1)-N(1)           -65.7(1)
 O(2)-P(1)-C(1)-P(2)           161.5(1)
 O(6)-P(2)-C(1)-P(1)           163.3(1)
 C(1)-N(1)-C(2)-C(3)          -148.2(2)
 C(5)-N(1)-C(2)-C(3)           -17.9(2)
 N(1)-C(2)-C(3)-C(4)            -7.6(2)
 C(2)-C(3)-C(4)-C(5)            30.3(2)
 C(3)-C(4)-C(5)-N(1)           -40.9(2)
 C(2)-N(1)-C(5)-C(4)            36.5(2)
 C(1)-N(1)-C(5)-C(4)           167.6(2)
 H(1)-C(1)-N(1)-H(2)           -74(2)
 H(1)-C(1)-N(1)-C(5)            42(2)
 H(1)-C(1)-N(1)-C(2)           168(2)