1,25(OH)2-16-Ene-23-yne-D3 1,25-Dihydroxy-16-ene-23-yne-vitamin D3 1,25-Dihydroxy-delta(16)-23-yne-vitamin D3 118694-43-2 1alpha,25-Dihydroxy-16ene, 23yne-vitamin D3 9,10-Secocholesta-5,7,10(19),16-tetraen-23-yne-1,3,25-triol, (1alpha,3beta,5Z,7E)- Ro 23-7553 Ro-23-7553