CDP-L-ribitol pyrophosphorylase A hCG_1745121 IspD Nip notch1-induced protein 4-diphosphocytidyl-2C-methyl-D-erythritol synthase homolog (Arabidopsis) D-ribitol-5-phosphate cytidylyltransferase isoprenoid synthase domain containing LGMDR20 MDDGA7 MDDGC7 hISPD 2-C-methyl-D-erythritol 4-phosphate cytidylyltransferase-like protein 4-diphosphocytidyl-2C-methyl-D-erythritol synthase homolog testicular tissue protein Li 97 ISPD Isoprenoid synthase domain-containing protein EC 2.7.7.40